| HYPERFINE STRUCTURE AND ELECTRON DENSITIES IN AROMATIC FREE $RADICALS^{1}$ (1956) | |||||||||
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| $^{1}$This work has been supported by the United States Air Force through the Office of Scientific Research of the Air Research and Development Command.. Author Institution: Department of Chemistry, Washington University. The paramagnetic resonance absorption spectra of anthracene and biphenyl univalent anion contain 21 and 9 peaks respectively. With the aid of Huckel’s m.o. approximation the electron densities of these radicals were calculated. Assuming the charge density as the determining factor for the hyperfine splitting, we were able to explain our experimental results. In accordance with the charge density at the connecting carbon atoms of the two phenyl rings in a biphenyl negative ion, the paramagnetic resonance absorption spectrum of this compound proved to be about 23% shorter than the spectrum of naphthalene anion, where Huckel puts the odd electron in an orbital with zero densities at the two central carbon atoms. The optical spectra of uni- and bivalent anions of anthracene were measured. | |||||||||
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