Electronic spectra of square-planar bis(biuretato) cobaltate (III)-type complexes.
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概要
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Several square-planar cobalt(III) complexes of bis(biuretato)-type were synthesized with new quadridentate ligands, alkylenebis(biuret)'s, where alkylene bridging group is (<I>R</I>,<I>S</I>)- or (<I>R</I>)-propylene, 1,1-dimethylethylene, <I>cis</I>-1,2-cyclohexylene, or tetramethylethylene. Faraday parameters for possible CT transitions in the complexes were expressed as functions of MO coefficients and energies. From the examination of the magnetic circular dichroism, the intense absorption band observed at ca. 20×10<SUP>3</SUP> cm<SUP>−1</SUP> was assigned to ligand-to-metal charge-transfer transitions of ligand π(a<SUB>u</SUB> of D<SUB>2h</SUB>) to metal d<SUB>yz</SUB> and d<SUB>zx′</SUB>, and the ground state was inferred to be one close to D<SUB>4h</SUB> symmetry. The band assignment was also consistent with the resonance Raman spectrum of potassium bis(biuretato)cobaltate(III). Absorption spectra of the complexes occasionally lost intensity with decrease of temperature. Origin of the thermochromism, which was found to be reversible, was also discussed.
- 公益社団法人 日本化学会の論文
著者
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Kanamori Kan
Department Of Chemistry Faculty Of Science Toyama University
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Komorita Takashi
Department Of Chemistry Faculty Of Science Osaka University
-
Fujita Masanori
Department Of Animal Science Faculty Of Agriculture Tohoku University:(present Address) Department O
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KANAMORI Kan
Department of Chemistry, Faculty of Science, Toyama University
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Shimura Yoichi
Department of Chemistry Faculty of Science Osaka University
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Hayashi Sawako
Department of Chemistry, Faculty of Science, Osaka University
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