| Behavior of Tri(n-butyl)ammonium Bis[citrato(3-)-O1,O3,O6] silicate in Aqueous Solution: Analysis of a Sol-Gel Process by Small-Angle Neutron Scattering (2005) | |||||||||||
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| Inorg Chem Behavior Tri butyl ammonium Bis citrato silicate Aqueous Solution Analysis Sol Gel Process Small Angle Neutron Scattering Oliver Seiler Christian Burschka Dietmar Schwahn and Reinhold Tacke Institut fur Anorganische Chemie UniVersitat Wurzburg Hubland Wurzburg Germany and Institut fur Festkorperforschung Forschungszentrum Julich GmbH Julich Germany Received September The racemic hexacoordinate silicon complex tri butyl ammonium bis citrato silicate was synthesized treatment OMe with molar equiv citric acid and molar equiv Bu The corresponding germanium analogue tri butyl ammonium bis citrato germanate structurally characterized single crystal ray diffraction was obtained analogously starting from OMe Upon dissolution water the silicate dianion hydrolyzes spontaneously formation and citric acid whereas the germanate dianion was found stable water Aqueous solutions with concentrations that are significantly higher than the saturation concentration look absolutely clear over period several weeks however reality these solutions are sols with very small particles that slowly grow with time and finally form gel that precipitates This sol gel process was monitored small angle neutron scattering SANS For reasons comparison aqueous solution the hydrolytically stable germanium compound was also studied the SANS technique Introduction context with our studies higher coordinate silicon complexes and their potential role silicon biochemistry have reported the synthesis and stru | |||||||||||
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