The Electron Spin Resonance of Binuclear Vanadyl Tartrates
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概要
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The ESR spectra of aqueous solutions of binuclear vanadyl tartrates remarkably varied with their pH values. This variation was found to be directly correlated with the change in the form of the carboxyl group, <I>i.e.</I> whether it was dissociated or acidic. Thus, the frozen solution spectra were observed in water-ethylene glycol at 77°K and analyzed in terms of several magnetic parameters containing the parameter of magnetic dipolar interaction, <I>D</I>. From these <I>D</I> values, the intramolecular V···V distances were estimated to be <I>ca.</I> 4.2, 5.2, and 6.5Å in the solutions at pH 9, 4.8, and 2.8 respectively. Such a remarkable change in the V···V distances as interpreted to be caused by the dissociation of the coordinate bonds between the vanadium atom and the carboxyl oxygen atom and the change in the molecular structure of the tartrates, brought about the change in the form of the carboxyl groups.
- 公益社団法人 日本化学会の論文
著者
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Hasegawa Akinori
Department Of Chemistry Kogakkanuniversity
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Yamada Yoshio
Department Of Agricultural Chemistry Faculty Of Agriculture
-
Miura Masaji
Department of Chemistry, Faculty of Science, Hiroshima University
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