Electron-spin-resonance Studies of the Formation and Properties of the Trimeric Vanadyl Dibutylphosphate Complex
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概要
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The extraction of the vanadyl ion (VO<SUP>2+</SUP>) from aqueous solutions by di-<I>n</I>-butylphosphoric acid ((C<SUB>4</SUB>H<SUB>9</SUB>O)<SUB>2</SUB>-PO<SUB>2</SUB>H) in hexane has been studied by ESR. It has been found that monomeric and trimeric vanadyl di-<I>n</I>-butylphosphate complexes were present in the organic phase, and the equilibrium constant of the reaction involving monomeric and trimeric forms was determined. The ESR spectrum of the trimeric complex, characterized by 22 hf lines with a separation of 39 gauss, was interpreted as resulting from the magnetic exchange interaction between three vanadyl ions. A crystalline vanadyl complex was isolated from the hexane solution and found to be (VOX<SUB>2</SUB>)<SUB>3</SUB>, where X represents (C<SUB>4</SUB>H<SUB>9</SUB>O)<SUB>2</SUB>PO<SUB>2</SUB><SUP>−</SUP>. The properties of the complex were investigated by means of ESR, IR, and the optical absorptions. The mechanism of the extraction of VO<SUP>2+</SUP> by (C<SUB>4</SUB>H<SUB>9</SUB>O)<SUB>2</SUB>PO<SUB>2</SUB>H was discussed, and a cyclic model was proposed for the structure of (VOX<SUB>2</SUB>)<SUB>3</SUB>.
- 公益社団法人 日本化学会の論文
著者
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Fujita Yuzaburo
Faculty Of Pharmaceutical Sciences Okayama University
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Kwan Takao
Faculty Of Pharmaceutical Sciences Teikyo University
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Sato Mitsuo
Faculty Of Engineering Tohoku University
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Takayanagi Teruo
Faculty of Pharmaceutical Sciences, The University of Tokyo
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