Guo, D., Spek, A.L., Kooijman, H., Zuilhof, H., Sijbesma, R.P.
A 3-ureidobenzo-1,2,4-triazine 1-N-oxide (1) was synthesized successfully. The derivative displays an acceptor-donor-acceptor-acceptor (ADAA) hydrogen-bonding motif in CDCl3 and DMSO-d6 solution as...
Bruijnincx, P.C.A., Buurmans, I.L.C., Gosiewska, S., Moelands, M.A.H., Lutz, M., Spek, A.L., ...
The Rieske dioxygenases are a group of non-heme iron enzymes, which catalyze the stereospecific cis-dihydroxylation of its substrates. Herein, we report the iron(II) coordination chemistry of the...
Toward poly(aminophthalimide), structures of dimers and trimers (2008)
Katayama, H., Kooijman, H., Spek, A.L., Meijer, E.W.
Poly(aminophthalimide) (PAP) dimers and trimers have been synthesized by palladium-catalyzed cross-coupling reactions of 3-aminophthalimides with 3-chloro- and 3,6-dichlorophthalimide, respectively....
Wide-bite-angle diphosphinines: Design, synthesis, and coordination properties (2008)
Müller, C., Freixa, Z., Lutz, M., Spek, A.L., Vogt, D.
A wide-bite-angle diphosphinine ligand has been designed and synthesized, which exhibits structural features for a preferred formation of trans complexes. Due to the linear orientation of the...
Flapper, J., Wormald, P., Lutz, M., Spek, A.L., Elsevier, C.J., ...
The coordination mode in a metal complex is critically dependent on the ligands surrounding the metal, on the precursors used, and on the conditions during synthesis. Our goal was to obtain palladium...
Doro, F., Lutz, M., Reek, J.N.H., Spek, A.L.
The synthesis and resolution of chiral phenoxaphosphane 3, with the stereogenic center at the phosphorus atom, is described. Compound 3 has been synthesized following a well-known procedure for...
Groenendaal, Bas, Ruijter, Eelco, Lutz, M., Spek, A.L., Orru, R.V.A.
Triazinane diones, readily generated by a recently reported multicomponent reaction, can be easily alkylated with various alkyl halides, allowing a wide variety of complexity-generating secondary...
Bruijnincx, P.C.A., Viciano-Chumillas, Marta, Lutz, M., Spek, A.L., Reedijk, J., Koten, G. Van, ...
Copper(II) complexes of the potentially tripodal N,N,O ligand 3,3-bis(1-methylimidazol-2-yl)propionate (L1) and its conjugate acid HL1 have been synthesised and structurally and spectroscopically...
Benisvy, Laurent, Gamez, P., Fu, W.T., Kooijman, H., Spek, A.L., Meijerink, A., ...
The first examples of lanthanide complexes with a 2-hydroxyisophthalate ligand are reported; the blue-emitting ligand acts as a very efficient sensitizer of the Tb(III) green emissions and does so in...
Indole-3-thiouronium nitrate (2008)
Lutz, M., Spek, A.L., Koten, G. Van
In the title compound, C9H10N3S+·NO3-, the indole ring system and the thiouronium group are nearly perpendicular, with a dihedral angle of 88.62 (6)°. Hydrogen bonding generates two-dimensional...
Indole-3-thiouronium iodide (2008)
Lutz, M., Spek, A.L., Koten, G. Van
In the title compound, C9H10N3S+·I-, the indole ring system and the thiouronium group are essentially perpendicular, with a dihedral angle of 89.87 (8)°. By intermolecular hydrogen bonding, a...
Multipole refinement of 2-(indol-3-yl)-1,1,3,3-tetramethylthiouronium nitrate (2008)
Lutz, M., Spek, A.L., Koten, G. Van
The cation of the title compound, C13H18N3S+·NO3-, consists of two subunits, viz. a planar indole moiety and a nonplanar thiouronium moiety. An isolated intermolecular hydrogen bond connects the...
Bonnet, Sylvestre A., Lutz, M., Spek, A.L., Koten, G. Van
Stable heterobimetallic complexes of the type [MX(NCN)Ru(C5R5)]+ (R = H or Me), where the phenylene ring of an NCN-pincer ligand coordinates first to a platinum or palladium center via a σ-bond, and...
Gosiewska, S., Martinez Herreras, Sara D., Lutz, M., Spek, A.L., Havenith, R.W.A., ...
New chiral NCN-pincer palladium complexes containing bulky diphenylhydroxymethyl pyrrolidinyl moieties as chiral auxiliaries have been synthesized. Oxidative palladium addition to ligand 2 (2 =...
Kruithof, C.A., Dijkstra, H.P., Lutz, M., Spek, A.L., Koten, G. Van
SCS-pincer metal complexes [MX(SCS)] (SCS = [2,6-(RSCH2)2C6H3]−; R = Ph: PhSCS; R = Me: MeSCS; M = Pd, Pt, Ni) have been synthesized via mild and tolerant oxidative addition procedures. The...
McDonald, A.R., Lutz, M., Chrzanowski, L.S. Von, Spek, A.L., Koten, G. Van
We have developed techniques which allow for covalent tethering, via a “hetero” cyclometallating ligand, of heteroleptic tris-cyclometallated iridium(III) complexes to polymeric supports (for...
Wide-bite-angle diphosphinines: design, synthesis, and coordination properties (2008)
Müller, Christian, Freixa, Z., Lutz, M., Spek, A.L., Vogt, D.
A wide-bite-angle diphosphinine ligand has been designed and synthesized, which exhibits structural features for a preferred formation of trans complexes. Due to the linear orientation of the...
Müller, Christian, Pidko, E.A., Lutz, M., Spek, A.L., Vogt, D.
Phosphinines (phosphabenzenes, phosphorins), the higher homologues of pyridines are low-coordinated phosphorus compounds that possess significantly different steric and electronic properties compared...
Müller, Christian, Pidko, E.A., Lutz, M., Spek, A.L., Vogt, D.
Phosphinines (phosphabenzenes, phosphorins), the higher homologues of pyridines are low-coordinated phosphorus compounds that possess significantly different steric and electronic properties compared...
Müller, Christian, Pidko, E.A., Lutz, M., Spek, A.L., Santen, R.A. Van, ...
Both enantiomers of the first atropisomeric phosphinine (1) have been isolated by using analytical HPLC on a chiral stationary phase. The enrichment of one enantiomer and a subsequent investigation...
Siegler, M.A.M., Kooijman, H., Spek, A.L.
In the chiral title compound, C18H28O3, the two six-membered rings of the perhydronaphthalenone adopt a rigid chair–chair conformation and the five-membered dioxolanyl ring adopts an envelope...
Roy, S., Hagen, Katharine D., Maheswari, P.U., Lutz, M., Spek, A.L., Reedijk, Jan, ...
Phenanthroline derivatives are of interest due to their potential activity against cancer, and viral, bacterial, and fungal infections. In a search for highly specific antitumor and antibacterial...
T-shaped cationic cu complexes with hemilabile pnp-type ligands (2008)
Pidko, E.A., Vogt, D., Lutz, M., Spek, A.L., Meetsma, A.
The versatile coordination behavior of the PNP ligands 1A (2,6- bis[(di-tert-butylphosphino)methyl]pyridine) and 1B (2,6-bis[(diphenylphosphino) methyl]pyridine) to CuI is described, whereby a...
Wolf, Robert, Ehlers, A.W., Slootweg, J.C., Lutz, M., Gudat, Dietrich, Hunger, Michael, ...
Phosphaalkynes (RC=P) are valuable starting materials for a wide range of low-coordinate phosphorus compounds.[1] Similar to alkynes,[2] these reactive, triply-bonded molecules oligomerize in the...
Döring, Katrin, Taher, D., Walfort, B., Lutz, M., Spek, A.L., ...
The synthesis and characterization of homobimetallic palladium and platinum complexes of type [(Me(O)CS-4-NCN–M ← N∩N → M–NCN-4-SC(O)Me](OTf)2 (Me(O)CS-4-NCN =...
Fused tricyclic phosphiranes - analysis of phosphorus chemical shieldings (2008)
Couzijn, E.P.A., Ehlers, A.W., Slootweg, J.C., Schakel, M., Krill, S., Lutz, M., ...
1,2-Addition of transient W(CO)5-complexed phosphinidenes exo to hexamethyl Dewar benzene affords the novel 3-phosphatricyclo[3.2.0.02,4]hept-6-ene complexes. The fused tricyclic phosphiranes are...
Doro, Franco, Lutz, M., Reek, J.N.H., Spek, A.L.
The synthesis and resolution of chiral phenoxaphosphane 3, with the stereogenic center at the phosphorus atom, is described. Compound 3 has been synthesized following a wellknown procedure for...
Gainsford, Graeme J., Bhuiyan, M. Delower H., Kay, Andrew J., Spek, A.L.
The title compound, C19H20N4O, crystallizes as twinned crystals containing two independent molecules which pack into a three-dimensional matrix via several C-HN(cyano) interactions, with a C...N...
Gorkum, R. Van, Berding, Joris, Mills, A.M., Kooijman, H., Tooke, D.M., Spek, A.L., ...
The preparation of new manganese and iron complexes with the general formula [M(tripod)(anion)] is described, where M = FeIII or MnIII, “tripod” is a dianionic tetradentate tripodal ligand and...
Lutz, M., Spek, A.L., Meijer, E.W., Sijbesma, R.P.
The kinetics of association of ureido-pyrimidinone (U) dimers, present either in the 4[1H]-keto form or in the pyrimidin-4-ol form, with 2,7-diamido-1,8-naphthyridine (N) into a complementary...
Determination of absolute structure using Bayesian statistics on Bijvoet differences (2008)
Hooft, R.W.W., Straver, Leo H., Spek, A.L.
A new probabilistic approach is introduced for the determination of the absolute structure of a compound which is known to be enantiopure based on Bijvoet-pair intensity differences. The new method...
Diastereoselective formation of complexed methylenediphosphiranes (2008)
Jansen, Helen, Rosenthal, Amos J., Slootweg, J.C., Ehlers, A.W., Lutz, M., Spek, A.L., ...
Stable syn-substituted methylenediphosphirane complexes are obtained from the reaction of transient, electrophilic phosphinidenes [R-PdW(CO)5] (R ) Me, Ph), thermally generated from the corresponding...
Ligthart, J.G.M., Guo, Dawei, Spek, A.L., Kooijman, H., Zuilhof, Han, Sijbesma, R.P.
A 3-ureidobenzo-1,2,4-triazine 1-N-oxide (1) was synthesized successfully. The derivative displays an acceptor-donor-acceptor-acceptor (ADAA) hydrogen-bonding motif in CDCl3 and DMSO-d6 solution as...
Assema, S.G.A., Tazelaar, C.G.J., Jong, G.B. De, Maarseveen, J.H. Van, Schakel, M., Lutz, M., ...
The copper-catalyzed Click reaction of phenyl azide with ethynylphosphine oxides provides new P-substituted triazoles. With tris(ethynyl)phosphine oxide this route affords a versatile scorpionate...
Köcher, S., Lutz, M., Spek, A.L., Walfort, B., Rüffer, Tobias, ...
The oxime-substituted NCN-pincer molecules HONCH-1-C6H3(CH2NMe2)2-3,5 (2a) and HONCH-4-C6H2(CH2NMe2)2-2,6-Br-1 (2b) were accessible by treatment of the benzaldehydes H(O)C-4-C6H3(CH2NMe2)2-3,5 (1a)...
Köcher, S., Walfort, B., Mills, A.M., Spek, A.L., Koten, G. Van, ...
Nitrile-functionalized NCN-pincer complexes of type [MBr(NC-4-C6H2(CH2NMe2)2-2,6)] (6a, M = Pd; 6b, M = Pt) (NCN = [C6H2(CH2NMe2)2-2,6]−) are accessible by the reaction of...
Self-assembly of para-OH functionalized ECE-metalated pincer complexes (2008)
Mehendale, N.C., Lutz, M., Spek, A.L., Koten, G. Van
Various para-OH functionalized ECE–pincer metal complexes [MX(ECE–OH)Ln] (ECE–OH = [C6H2(CH2E)2-2,6-OH-4]−, E = NMe2, PPh2 and SPh) were synthesized. The X-ray crystal structures of neutral...
Kruithof, C.A., Dijkstra, H.P., Lutz, M., Spek, A.L., Egmond, M.R., ...
Organometallic NCN-pincer complexes, bearing either a p-nitrophenyl phosphonate ester or a phosphonic acid group directly attached to the aromatic ring of the pincer complex, were synthesized. These...
Chase, P.A., Lutz, M., Spek, A.L., Gossage, R.A., Koten, G. Van
The reaction of NCNLi pincers (NCN = [2,6-(R2NCH2)2C6H3]-, R = Me ( 3), Et ( 4)) with various equivalents of nBuLi in non-polar solvent results in the generation of novel mixed alkyl–aryl...
Tazelaar, C.G.J., Jong, G.B. De, Maarseveen, J.H. Van, Schakel, M., Lutz, M., ...
The copper-catalyzed Click reaction of phenyl azide with ethynylphosphine oxides provides new P-substituted triazoles. With tris(ethynyl)phosphine oxide this route affords a versatile scorpionate...
Weckhuysen, B.M., Bruijnincx, P.C.A., Lutz, M.H., Spek, A.L., Hagen, W.R., Koten, G. Van, ...
Mononuclear iron(II)- and iron(III)-catecholato complexes with three members of a new 3,3-bis(1-alkylimidazol-2-yl)propionate ligand family have been synthesized as models of the active sites of the...
New manganese-based catalyst systems for alkyd paint drying (2007)
Liu, Z., Kooijman, H., Spek, A.L., Bouwman, E.
The autoxidation and oligomerisation of ethyl linoleate (EL) catalyzed by manganese salts in combination with several Schiff-base ligands has been studied making use of time-resolved FT-IR...
On the structure of cross-conjugated 2,3-diphenylbutadiene (2007)
Walree, C.A. Van, Jenneskens, L.W., Lutz, M., Spek, A.L., Havenith, R.W.A., ...
The structure of the cross-conjugated compound 2,3-diphenylbutadiene was investigated by single-crystal X-ray diffraction and computational methods. In the crystal structure the central butadiene...
Luminescent and electronic properties of stilbenoid NCN-pincer PtII compounds (2007)
Batema, G.D., Guerra, J., Lutz, M., Spek, A.L., Walree, C.A. Van, ...
A series of novel 4,4'-disubstituted organic-organometallic stilbenes were synthesized, that is, the 4'-substituted stilbenoid- NCN-pincer platinum(II) complexes [PtCl(NCN-R-4)] (NCN-R-4 =...
Gosiewska, S., Lutz, M., Spek, A.L.
Mononuclear iron(II) complexes of enantiopure Py(ProOH)2 (2) and Py(ProPh2OH)2(3) ligands have been prepared with FeCl2 and Fe(OTf)2 . 2MeCN. Both ligands coordinate to the metal in a pentadentate...
2-Carboxy-4-(hydroxymethyl)pyridinium chloride hemihydrate (2007)
Chrzanowski, L.S. Von, Lutz, M., Spek, A.L., McDonald, A.R., Koten, G. Van
The title compound, C7H8NO3+·Cl-·0.5H2O, features inter- and intramolecular O-HCl and N-HO hydrogen bonds, linking the molecules into a three-dimensional network. The water molecule is located on a...
“Click” 1,2,3-triazoles as tunable ligands for late transition metal complexes (2007)
Aerts, B.N.H., Dijkstra, H.P., Lutz, M., Spek, A.L., Koten, G. Van, ...
The potential of "click" 1,2,3-triazoles to act as mono-dentate ligands in late transition metal complexes is explored relative to other commonly-used Lewis bases and it is shown that their...
Chrzanowski, L.S. Von, Lutz, M., Spek, A.L.
In the title compound [Pt(C17H22N3O4)I(I2)]·0.5CH2Cl2, the coordination environment of the PtII centre is distorted square-pyramidal and is defined by two neutral N atoms and an anionic C atom from...
3,5-Bis[(dimethylamino)methyl]-1-nitro-4-(trimethylsilyl)benzene (2007)
Chrzanowski, L.S. Von, Lutz, M., Spek, A.L., Slagt, M.Q., Koten, G. Van
The title compound, C15H27N3O2Si, which is an NCN {NCN = 2,6-bis[(dimethylamino)methyl]phenyl} pincer ligand, nitro-substituted in the para position, features intramolecular C—H...N and...
Bruijnincx, P.C.A., Lutz, M., Spek, A.L., Hagen, W.R., Koten, G. Van
The structural and spectroscopic characterization of mononuclear iron(III)-catecholato complexes of ligand L4 (methyl bis(1-methylimidazol-2-yl)(2-hydroxyphenyl)methyl ether, HL4) are described,...
Cyclometalated ruthenium complexes for sensitizing nanocrystalline TiO2 solar cells (2007)
Wadman, S.H., Kroon, J.M., Bakker, K., Lutz, M., Spek, A.L., ...
Cyclometalated ruthenium complexes of [Ru(C^N^N)(N^N^N)] configuration are a promising new class of molecular sensitizers for dye-sensitized solar cells, as a result of their broad and red-shifted...
Gagliardo, M., Rizzo, F., Lutz, M., Spek, A.L., Merbach, A.E., ...
The redox- and photoactive mononuclear complex [Ru(PCP)(tpy-DTTANa4)]Cl {PCP = [C6H3(CH2PPh2)2-2,6]-; tpy-DTTA4- = 4'-(2,2':6',2''-terpyridine)-diethylenetriamine-N,N,N",N"-tetraacetate} possesses an...
A new, easily recyclable arylating agent based on a diphosphino-digold(I) complex (2007)
Stol, M., Snelders, D.J.M., Kooijman, H., Spek, A.L., Koten, G. Van
The synthesis of two organogold(I) complexes, [(Au(NCN))2(dppbp)] (6) and [(Au(Phebox))2(dppbp)] (9), and their application in subsequent transmetalating reactions are described. A trinuclear...
Coevering, R. Van De, Bruijnincx, P.C.A., Lutz, M., Spek, A.L., Koten, G. Van
The structural aspects and host–guest binding properties of ionic core–shell dendrimers [1]Br8 and [2]Br4, which bear a polycationic core and a neutral shell of Fréchet-type poly(benzyl aryl...
Tooke, D.M., Spek, A.L., Koten, G. Van
A series of meso-tetrakis-(ERE donor) zinc(II) porphyrins nZn (ERE donor=4-R-3,5-bis[(E)-methyl]phenyl; 1Zn: E=NMe2, R=Br; 2Zn: E=NMe2, R=H; 3Zn: E=OMe, R=Br; 4Zn: E=OMe, R=H) have been synthesized...
Bis{2-[(dimethylamino-κN)methyl]-benzenethiolato-κS}zinc(II) (2007)
Chrzanowski, L.S. Von, Lutz, M., Spek, A.L., Kleijn, H., Koten, G. Van
In the title compound, [Zn(C9H12NS)2], the ZnII center is located on a twofold rotation axis and is coordinated in a distorted tetrahedral environment in a bidentate fashion by anionic thiolate S and...
Stol, M., Snelders, D.J.M., Godbole, M.D., Havenith, R.W.A., Haddleton, D.M., Clarkson, G., ...
2,6-Bis(oxazolinyl)phenylnickel bromide complexes [NiBr(R,R'-Phebox)] (2) were synthesized via two synthetic routes (A and B). In route A, selective bis-ortho lithiation of [R,R'-PheboxBr], followed...
Bruijnincx, P.C.A., Lutz, M., Breejen, J.P. Den, Spek, A.L., Koten, G. Van
The coordination chemistry of the 2-His-1-carboxylate facial triad mimics 3,3-bis(1-methylimidazol-2-yl)propionate (MIm2Pr) and 3,3-bis(1-ethyl-4-isopropylimidazol-2-yl) propionate (iPrEtIm2Pr)...
Angamuthu, R., Kooijman, H., Lutz, M., Spek, A.L., Bouwman, E.
The hexanuclear [Ni6L12] (2) wheel-type cluster adopts an unusual structural motif whereby four NiS4 square-planar and two NiS5 square-pyramidal units are conjoined by edge sharing; the NiS5 units...
Novel Linear Transition Metal Clusters of a Heptadentate Bis-ß-diketone Ligand (2007)
Aromí, G., Gamez, P., Krzystec, J., Kooijman, H., Spek, A.L., Bouwman, E.
The synthesis and the structure of the new potentially heptadentate ligand 1,3-bis-(3-oxo-3-(2-hydroxyphenyl)-propionyl)-2-methoxybenzene (H5L) is described. The reaction in pyridine or DMF of this...
Acetylene-Substituted Phosphane Oxides: Building Blocks for Macrocycles (2007)
Assema, S.G.A., Jong, G.B. De, Ehlers, A.W., Schakel, M., Spek, A.L., ...
Phosphorus-based macrocycles with acetylenic scaffolds have been built from acetylene-substituted phosphane oxides that were formed from diisopropylphosphoramidic dibromide (3) and an acetylenic...
Highly Selective Hydrocyanation of Butadiene toward 3-Pentenenitrile (2007)
Bini, L., Mueller, C., Wilting, J., Chrzanowski, L.S. Von, Spek, A.L., Vogt, D.
Multicomponent Synthesis of N-Heterocyclic Carbene Complexes (2007)
Bon, R.S., Lutz, M., Spek, A.L., Jahnke, M., Hahn, F.E., ...
N-Heterocyclic carbenes (NHCs) are valuable ligands in transition metal catalysis, due to their unique electronic properties. However, only a few routes toward unsymmetrically substituted, saturated...
Chang, T., Pieterse, K., Broeren, M.A.C., Kooijman, H., Spek, A.L., Hilbers, M.F., ...
The multiple monovalent binding of adamantyl-urea poly(propyleneimine) dendrimers with carboxylic acid-urea guests was investigated using molecular dynamics simulations and Xray crystallography to...
α-Tris(2,4-pentanedionato-κ2O,O’)-chromium(III) at 290 and 110 K: a new δ phase at 110 K (2007)
Chrzanowski, L.S. Von, Lutz, M., Spek, A.L.
The crystal structure of the title compound, [Cr(C5H7O2)3], has been determined at 290 and 110 K to provide information on thermal vibrations and disorder. The polymorph at room temperature has been...
Chrzanowski, L.S. Von, Lutz, M., Spek, A.L.
The crystal structure of the title compound, [Al(C5H7O2)3], has been investigated by a multi-temperature measurement to provide information on thermal vibrations and disorder in the structure. At 110...
α-Tris(2,4-pentanedionato-κ2O,O')cobalt(III) at 240, 210, 180, 150 and 110 K (2007)
Chrzanowski, L.S. Von, Lutz, M., Spek, A.L.
The crystal structure of the title compound, [Co(C5H7O2)3], has been investigated by a multi-temperature measurement. In contrast to the isomorphous Al compound, the title compound exists in the...
1,1'-Bis(ferrocenylphenylphosphino)-ferrocene (2007)
Chrzanowski, L.S. Von, Lutz, M., Spek, A.L.
In the title compound, [Fe3(C5H5)2(C16H13P)2], two (C6H5)P-[(C5H4)Fe(C5H5)](C5H4) units are bridged by an Fe atom, located on an inversion center, giving a central third ferrocene unit. Each Fe atom...
Bis(μ-N-tert-butyl-2-{N-[2-(dimethylamino)ethyl]-N-methylamino}ethanaminato)dilithium(I) (2007)
Chrzanowski, L.S. Von, Lutz, M., Spek, A.L.
The title compound [Li2(C11H26N3)2], is a dimer chelate complex and features a planar Li2N2 ring with an Li...Li distance of 2.449 (3) A ° and a bicyclic ring system. The coordination geometry of...
{4-Allyloxy-2,6-bis[(dimethylamino)methyl]phenyl-κ3C1,N,N'}iodidopalladium(II) (2007)
Chrzanowski, L.S. Von, Lutz, M., Spek, A.L., Dijkstra, H.P., Koten, G. Van
In the title compound, [PdI(C15H23N2O)], the coordination environment of the central PdII atom is distorted squareplanar. The PdII atom is coordinated by two neutral N atoms, an anionic C atom, and...
Nucleic acids in two dimensions: layers of base pairs linked by carboxylate (2007)
Corral, E., Kooijman, H., Spek, A.L., Reedijk, J.
The formation of a planar 2D hydrogen-bonded network between DNA bases and formate residues is reported, leading to unprecedented parallel sheets of DNA analogues.
Platinum-catalyzed hydroformylation of terminal and internal octenes (2007)
Duren, R. Van, Kooijman, H., Spek, A.L., Vogt, D.
A brief historic overview of Pt/Sn-catalyzed hydroformylation as well as recent advances in the hydroformylation of internal alkenes is provided. This serves as background for the results obtained...
Trapping of the highly strained [5](2,4)quinolinophane system (2007)
Eis, M.J. Van, Lutz, M., Spek, A.L., Wolf, W.H. De, Bickelhaupt, F.
The highly strained [5](2,4)quinolinophane system can be generated as an intermediate (2b), which is extremely susceptible towards the attack of both nucleophilic and electrophilic species. Addition...
Gagliardo, M., Amijs, C.H.M., Lutz, M., Spek, A.L., Havenith, R.W.A., Hartl, F., ...
The dinuclear complex [(tpy)RuII(PCP?PCP)RuII(tpy)]Cl2 (bridging PCP-PCP ) 3,3',5,5'-tetrakis(diphenylphosphinomethyl) biphenyl, [C6H2(CH2PPh2)2-3,5]2 2-) was prepared via a transcyclometalation...
Garza-Ortiz, A., Dulk, H. Den, Brouwer, J., Kooijman, H., Spek, A.L., Reedijk, J.
A new Au(III) coordination compound with the ligand 2-(phenylazo)pyridine has been synthesized and fully characterized by means of elemental analysis, IR, UV–visible, conductivity measurements,...
Crystallization and Characterization of a New Magnesium Sulfate Hydrate MgSO4.11H2O (2007)
Genceli, F.E., Lutz, M., Spek, A.L., Witkamp, G.J.
The MgSO4 crystal hydrate formed below approximately 0 °C was proven to be the undecahydrate, MgSO4 • 11H2O (meridianiite) instead of the reported dodecahydrate MgSO4 • 12H2O. The crystals were...
Iron complexes of chiral phenol-oxazoline ligands: Structural studies and oxidation catalysis (2007)
Godbole, M.D., Prat Puig, M., Tanase, S., Kooijman, H., Spek, A.L., Bouwman, E.
Iron complexes of two ligands, HphoxCOOH and HphoxiPr, have been synthesized and characterized by crystal structure analyses. The complexes (HNEt3)2[Fe(phoxCOO)2](ClO4) and [Fe(phoxiPr)3] are...
Gorkum, R. Van, Berding, Joris, Tooke, D.M., Spek, A.L., Reedijk, J., Bouwman, E.
The activity of new manganese and iron complexes of dianionic tripodal ligands in the autoxidation of ethyl linoleate (EL) is reported. EL consumption rates were monitored using time-resolved FTIR...
Study on the isomerism in meso-amavadin and an amavadin analogue (2007)
Hubregtse, T., Kooijman, H., Spek, A.L., Maschmeyer, T., Sheldon, R.A., ...
An X-ray crystallographic study of ‘meso-amavadin’ revealed that in the crystal the negatively charged anionic species of the title compound join into infinite hydrogen-bonded chains,...
Metal-Directed Self-Assembly of a ZnII-salpyr Complex into a Supramolecular Vase Structure (2007)
Kleij, A.W., Kuil, M., Tooke, D.M., Spek, A.L., Reek, J.N.H.
A new type of supramolecular building block, ZnII-salpyr [salpyr = N,N'-3-pyridylenebis(salicylideneimine)], is described that contains both a pyridyl donor and a Lewis acidic ZnII acceptor site in...
Koval, I.A., Akhideno, H., Tanase, S., Belle, C., Duboc, C., Saint-Aman, E., ...
A linear trinuclear copper(II) complex containing phenoxido- and alkoxido-bridges between the metal centers has been isolated and structurally characterized. The complex cation consists of a linear...
Kuil, M., Goudriaan, P.E., Kleij, A.W., Tooke, D.M., Spek, A.L., ...
The template-induced formation of chelating bidentate ligands by the selective self-assembly of two monodentate pyridyl phosphorus ligands on a rigid bis-zinc(II) salphen template with two identical...
Matthews, J.R., Goldoni, F., Kooijman, H., Spek, A.L., Meijer, E.W.
A series of chiral thio- and oxo-substituted polythiophenes and polythienylethynylenes has been synthesised and investigated. The replacement of an oxo-linkage by a thio-linkage distorts and/or...
Atropisomeric phosphinines: design and synthesis (2007)
Müller, C., Pidko, E.A., Totev, D., Lutz, M., Spek, A.L., Santen, R.A. Van, ...
The first atropisomeric phosphinine was designed and prepared by introducing substituents into specific positions of the heterocyclic framework; the presence of axial chirality was predicted by means...
Müller, C., Wasserberg, D., Weemers, J.J.M., Pidko, E.A., Hoffmann, S., Lutz, M., ...
A series of donor-functionalized pyrylium salts have been prepared by classical condensation reactions which were further converted into the corresponding thienyl- and pyridyl-substituted polydentate...
Long-Range Magnetic Ordering in a TbIII-MoV Cyanido-Bridged Quasi-One-Dimensional Complex (2007)
Prins, F., Pasca, E., Jongh, L.J. De, Kooijman, H., Spek, A.L., Tanase, S.
A Tin(IV) Porphyrin with Two Axial Organometallic NCN-Pincer Platinum Units (2007)
Tooke, D.M., Spek, A.L., Koten, G. Van
A tin(IV) porphyrin was combined with two axial NCN-pincer platinum(II) fragments by utilizing the oxophilicity of the apical positions on the tin atom and the acidic nature of the NCN-pincer...
Quesada, M., Kooijman, H., Gamez, P., Sánchez Costa, J., Koningsbruggen, P.J. Van, Weinberger, P., ...
The reaction of btzmp (1,2-bis(tetrazol-1-yl)-2-methylpropane) with Fe(ClO4)2 generates a 1D polymeric species, [Fe(µ-btzmp)2(btzmp)2](ClO4)2, showing a steep spin transition (T1/2 = 136 K and T1/2...
Marcelli, T., Lutz, M., Spek, A.L., Maarseveen, J.H. Van, Hiemstra, H.
Racemic Baylis-Hillman carbonates can be converted in densely functionalized products by reaction with cyano esters in the presence of a catalytic amount of a modified Cinchona alkaloid in high...
Wilting, J., Janssen, M., Müller, C., Lutz, M., Spek, A.L., Vogt, D.
A series of chiral (R)-binaphthol-based diphosphite ligands with different substituents was prepared and applied in the asymmetric nickel-catalyzed hydrocyanation of styrene and 1,3-cyclohexadiene to...
Tooke, D.M., Zijp, E.J., Vogt, D., Spek, A.L.
The title compound, [PtCl2(C34H31NP2)], crystallizes with four crystallographically independent molecules. All four molecules have the same R chirality, with P-Pt-P bite angles ranging from 72.14 (5)...
Unique Ligand-Based Oxidative DNA Cleavage by Zinc(II) Complexes of Hpyramol and Hpyrimol (2007)
Maheswari, P.U., Barends, S., Özalp-Yaman, S., Hoog, P. De, Casellas, H., Teat, S.J., ...
The zinc(II) complexes reported here have been synthesised from the ligand 4-methyl-2-N-(2-pyridylmethyl)aminophenol (Hpyramol) with chloride or acetate counterions. All the five complexes have been...
Buijtenen, J. Van, Meuldijk, J., Hulshof, L.A., Kooijman, H., Spek, A.L.
Reaction of RuH2CO(PPh3)3 with tetrafluorosuccinic acid at 100 °C gave rise to the formation of the dinuclear bis(tetrafluorosuccinate)-bridged Ru(II) complex 2, containing two water ligands....
Gagliardo, M., Rodríguez, G., Dam, H.H., Lutz, M., Spek, A.L., Havenith, R.W.A., ...
A palladium-catalyzed Stille coupling reaction was employed as a versatile method for the synthesis of a novel terpyridine-pincer (3, TPBr) bridging ligand,...
Müller, Christian, Guarrotxena López, L., Kooijman, H., Spek, A.L., Vogt, D.
Novel hydroxy-functionalized phosphabenzenes were synthesized, which provide the possibility to prepare chiral phosphabenzene– phosphites. These systems act as bidentate ligands toward rhodium...
Gosiewska, S., Lutz, M., Spek, A.L., Koten, G. Van
A series of mononuclear iron(II) and zinc(II) complexes of the new chiral Py(ProMe)2 ligand (Py(ProMe)2 ) 2,6- bis[[(S)-2-(methyloxycarbonyl)-1-pyrrolidinyl]methyl]pyridine) have been prepared. The...
Kleijn, H., Kleij, A.W., Lutz, M., Spek, A.L., ...
New fluorous-organometallics based on the chiral ligand a-methyl-N,N-dimethylbenzylamine (TMBA) were prepared by treatment of fluorous silyl bromide reagents with in situ 4-lithiated TMBA to give...
Gosiewska, S., Martinez, S.H., Lutz, M., Spek, A.L., Koten, G. Van
Neutral NCN-pincer palladium bromide complex 2 containing the monoanionic, enantiopure pincer ligand 2,6-bis{[(S)- 2-hydroxymethyl-1-pyrrolidinyl]methyl}phenyl bromide (1) with bis-ortho-(S)-prolinol...
A Zig-Zag [MnII] Cluster from a Novel Bis(β-diketonate) Ligand (2006)
Aromí, G., Gamez, P., Boldron, Ch., Kooijman, H., Spek, A.L., Reedijk, J.
Keywords: Ligand design / O ligands / NMR spectroscopy / Magnetism / Mn A new ligand, H5L3, has been synthesized featuring seven linearly arranged oxygen donors in form of two 1,3-diketone and three...
Bidentate phosphorus baskets by intramolecular phosphinidene addition (2006)
Assema, S.G.A., Ehlers, A.W., Schakel, M., Spek, A.L., Lutz, M., ...
Intramolecular phosphinidene addition to the C=C bond of Mocomplexed, seven-membered phosphorus heterocycles affords three novel [(diphos)Mo(CO)4]complexes (18–20). The three bidentate phosphorus...
Browne, W.L., Ligtenbarg, A.G.J., Boer, J.W. De, Lutz, M., Spek, A.L., ...
The syntheses and spectroscopic characterization of two 1,2,4-triazole-based oxovanadium(V) complexes are reported: 1- [VO2L1]- and 2 [(VOL2)2(OMe)2] (where H2L1 )...
Circumambulatory rearrangement with characteristics of a 2:1 covalent molecular bevel gear (2006)
Bulo, R.E., Allaart, F., Ehlers, A.W., Schakel, M., Lutz, M., ...
anti-W(CO)5-complexed 9-methyl-9-phosphabicyclo[6.1.0]nonatriene represents a covalently interlocked molecular bevel gear. Correlated movement of the phosphorus atom and the eight-membered ring by...
Chiral (diphosphonite)platinum complexes in asymmetric hydroformylation (2006)
Duren, R. Van, Huijbers, J.P.J., Mills, A.M., Spek, A.L., ...
The chiral diphosphonite ligand (11bR,11’bR)-4,4’-(9,9-dimethyl-9H-xanthene-4,5-diyl)bis[dinaphtho[ 2,1-d:1’,2’-f][1,3,2]dioxaphosphepin] ((R,R)-XantBino; (R)-1), based on a rigid xanthene...
Centrosymmetric and pseudo-centrosymmetric structures refined as non-centrosymmetric (2006)
Flack, H.D., Bernardinelli, G., Clemente, D.A., Linden, A. Van Der, Spek, A.L.
The behaviour of the Flack parameter for centrosymmetric and pseudo-centrosymmetric crystal structures based on crystal structures published as being non-centrosymmetric is presented. It is confirmed...
Guiu, E., Caporali, M., Muñoz, B., Mueller, C., Lutz, M., Spek, A.L., ...
The electronic character of the diphosphine ligands controls the regioselectiVity of the Pd-catalyzed carbonylation of styrene. In the presence of electron-poor phosphines branched esters are...
Mueller, C., Lutz, M., Spek, A.L., Vogt, D.
The newdonor functionalized methylthio-phosphabenzene 3was synthesized by reaction of the corresponding pyrylium salt with P(SiMe3)3. This compound was characterized crystallographically, showing...
Paravidino, M., Bon, R.S., Scheffelaar, R., Vugts, D.J., Znabet, A., Schmitz, R.F., ...
In a search for new multicomponent strategies leading to valuable small heterocycles, a new highly diastereoselective four-component reaction (4CR) was found in which a phosphonate, nitriles,...
Quesada, M., Hoog, P. De, Gamez, P., Roubeau, O., Aromí, G., Donnadieu, B., ...
The coordination chemistry of the polydentate ligand 2,4,6- tris(dipyridin-2-ylamino)-1,3,5-triazine (dpyatriz) with FeII has been explored, leading through variation of the counterion and the...
Koval, I.A., Selmeczi, K., Belle, C., Philouze, C., Saint-Aman, E., Gautier-Luneau, I., ...
We report the structure, properties and a mechanism for the catecholase activity of a tetranuclear carbonato-bridged copper(II) cluster with the macrocyclic ligand [22]pr4pz...
Heterobimetallic Fe–Pd and Fe–Pt NCN pincer complexes (NCN = [C6H2(CH2NMe2)2-2,6][1]) (2006)
Köcher, S., Lutz, M., Spek, A.L., Prasad, R., Koten, G. Van, ...
(3R,5S,6S,8R,10S)-8-Acetyl-7-hydroxy-3-isopropenyl-10-methylperhydrophenanthren-1-one (2005)
Kooijman, H., Saraber, F.C.E., Spek, A.L.
In the crystal structure of the title compound, C20H30O3, there is an intramolecular hydrogen bond between the hydroxyl and acetyl groups [O...O = 2.722 (3) A]
Kooijman, H., Saraber, F.C.E., Spek, A.L.
The steroid ring B of the title compound, C22H32O, is in a half-chair conformation. The five-membered ring is in an intermediate form between the envelope and half-chair conformations
Koten, G. Van, Broeke, J. Van Den, Stam, M., Lutz, M.H., Kooijman, H., Spek, A.L., ...
The hydrophobic, low melting, 1-butyl-3-methylimidazolium (BMIm) salts [BMIm][BPh4] (1), [BMIm][B(C6H4Me-4)4] (2), [BMIm][B{C6H4(CF3)-4}4] (3), [BMIm][B{C6H3(CF3)2-3,5}4] (4),...
Koten, G. Van, Kronenburg, C.M.P., Lutz, M.H., Spek, A.L.
The neutral, mixed 2:2 aryl-alkynyl-cuprates [Cu2Li2(CCR)2Ar2] (Ar = [C6H4{CH2N(Me)CH2CH2NMe2}-2]-; R = C6H4Me-4 (3a) or C6H4SiMe3-4 (3b)) are the first examples of cuprates that contain two...
Slagt, M.Q., Dijkstra, H.P., McDonald, Aidan, Lutz, M.H., Ellis, D.D., ...
p-Nitro-substituted NCN-palladium complexes self-assemble into dimers in the solid state. A NO2-to-Pd(II) electron donor-acceptor (EDA) interaction is proposed to account for this observation....
Dijkstra, H.P., Slagt, M.Q., McDonald, Aidan, Kruithof, C.A., Kreiter, R., Mills, A.M., ...
Several para-substituted NCN-pincer palladium(II) complexes (1a-g and 6a-g) {NCN = [C6H3(CH2NMe2)2-2,6]-, para = 4-position} have been prepared and the electronic influences of the para substituents...
A new monoclinic crystal phase of [Bu4N][Ni(dmit)2] (2002)
Mulder, Martijn J.J., Kooijman, H., Spek, A.L., Haasnoot, J.G., Reedijk, Jan
The crystal structure of the title compound, tetrabutylammonium bis(2-thioxo-1,3-dithiole-4,5-dithiolato)nickelate(III), [N(C4H9)4][Ni(C3S5)2], is the fourth known phase of this polymorphous...
Koten, G. Van, Kleij, A.W., Gossage, R.A., Brinkmann, N., Reijerse, E.J., ...
Transmetalation of polylithiated, carbosilane (CS) dendrimers functionalized with the potentially terdentate ligand [C6H2(CH2NMe2)2-2,6-R-4]- ( = NCN) with NiCl2(PEt3)2 produced a series of...
Koten, G. Van, Meijer, M.D., Kleij, A.W., Lutz, M.H., Spek, A.L.
Treatment of the diaminobenzene [C{6}H{4}{CH{2}NMe{2}}{2}-1, 3] (NCN-H, 1) with one or two equivalents of cis-PtCl{2}(DMSO){2} leads to exclusive formation of the doubly cycloplatinated species...
Koten, G. Van, Meijer, M.D., Wolf, E. De, Lutz, M.H., Spek, A.L.
The application of platinum(II) complexes based on the N,N-dimethylbenzylamine ligand (abbreviated as H-C,N) in macromolecular synthesis was demonstrated. Two cationic C,N-platinum moieties were...
Koten, G. Van, Dijkstra, H.P., Meijer, M.D., Patel, J., Kreiter, R., ...
Novel strategies for the preparation of rigid cartwheel pincer metal complexes have been developed. The aromatic backbone of these materials ensures a high rigidity, which is expected to be important...
Koten, G. Van, Kleij, A.W., Kooijman, H., Lutz, M.H., ...
A series of cyclopalladated carbosilane dendrimers functionalized with monoanionic [C6H4(CH2NMe2)-4]- (= CN) C,N-chelating ligands via a multiple and selective C-H bond activation process have been...
Increasing the Lipophilic Character of Tetraphenylborate Anions through Silyl Substituents (2001)
Koten, G. Van, Broeke, J. Van Den, Lutz, M.H., Kooijman, H., Spek, A.L.
Trimethylsilyl- and dimethyl(1H,1H,2H,2H-perfluorooctyl)silyl substituents have been introduced in the para position of tetraphenylborate anions, resulting in enhanced solubility of their complexes...
Koten, G. Van, Casado Lacabra, M.A., Canty, A.J., Lutz, M.H., Patel, J., Spek, A.L., ...
The complex trans-PtCl(p-Tol)(SEt{2}){2} is obtained from the reaction of [Pt(p-Tol){2}(SEt{2})]{2} with PtCl{2}(SEt{2}){2} and SEt{2} in mole ratio 1:2:2. The mono(p-tolyl)platinum(II) and...
Koten, G. Van, Back, S., Lutz, M.H., Spek, A.L., Lang, H.
A series of homodinuclear Pt compounds containing the anionic, potentially terdentate NCN ligand (NCN=[C{6}H{3}(Me{2}NCH{2}){2}-2, 6]}-{) or its 4-ethynyl derivative were prepared. The two platinum...
Koten, G. Van, Kleij, A.W., Lutz, M.H., Spek, A.L.
A series of cycloplatinated carbosilane dendrimers appended with the monoanionic C, N-bidentate ligand [C{6}H{4}{CH{2}NMe{2}}-2]}-{ (CN) was prepared via a multiple C@?H activation reaction. Ligand...
Koten, G. Van, Albrecht, M.A., Gossage, R.A., Lutz, M.H., Spek, A.L.
series of square-planar platinum(II) complexes of the N,C,N-terdentate-coordinating monoanionic pincer ligand, [PtX(4-E-2,6-{CH2NRR}2-C6H2)] (X=Cl, Br, I, tolyl; R, R=Et, Me; E=H, OH, OSiMe2tBu) has...
Koten, G. Van, Rio, I. Del, Lutz, M.H., Spek, A.L.
The binuclear Ru(II) N2-bridged complex [{RuCl2(NN'N)}2(-N2)] (1; NN'N = 2,6-bis[(dimethylamino)methyl]pyridine) promotes the atom transfer radical polymerization (ATRP) of methyl methacrylate under...
Self-assembled Organoplatinum(II) Supermolecules as Crystalline, SO2 Gas-triggered Switches (2000)
Koten, G. Van, Albrecht, M.A., Lutz, M.H., Schreurs, A.M.M., Lutz, E.T.H., Spek, A.L.
Square-planar platinum(II) complexes containing N,C,N terdentate coordinating, anionic 'pincer' ligands reversibly bind gaseous SO2 in the solid state by Pt-S bond formation and cleavage giving...
Koten, G. Van, Gossage, R.A., Martinez, E.M., Frey, H., Burgath, A., Lutz, M.H., ...
A new organosilane, 4-(triallylsilyl)phenol, was prepared in high yield and utilised in the divergent and convergent synthesis of dendrimeric molecules. Novel bifurcate carbosilane dendrimers 1 were...
Koten, G. Van, Rio, I. Del, Gossage, R.A., Hannu, M.S., Lutz, M.H., Spek, A.L.
The binuclear Ru(II) 2-dinitrogen complex [{RuCl2(3-NN'N)}2(-N2)] (1, NN'N = 2,6-bis[(dimethylamino)methyl]pyridine) is an excellent starting material for the synthesis of mononuclear 2-alkene...
Design of novel Hexametallic Cartwheel Molecules From Persubstituted Benzene Compounds (1999)
Koten, G. Van, Dijkstra, H.P., Steenwinkel, P., Grove, D.M., Lutz, M.H., Spek, A.L.
Koten, G. Van, Rietveld, M.H.P., Teunissen, Wendy, Hagen, H., Water, L. Van De, Grove, D.M., ...
The potentially C,N,N'-chelating anionic aryldiamine ligand [C6H4(CH2N(Me)CH2CH2NMe2)-2]- (CNN) has been employed in the preparation of six-coordinate Ta(V) alkylidene complexes. The new dichloro...