An ESR Study of Some Substituted Pyridine <I>N</I>-Oxide Copper(II) Complexes
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概要
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The ESR (methanol solution, frozen solution, powder, and single crystal) spectra of [CuL<SUB>4</SUB>](ClO<SUB>4</SUB>)<SUB>2</SUB>, where L=pyridine <I>N</I>-oxide, α-picoline <I>N</I>-oxide, β-picoline <I>N</I>-oxide, γ-picoline <I>N</I>-oxide, and 2,6-lutidine <I>N</I>-oxide, and of [CuL<SUB>6</SUB>](ClO<SUB>4</SUB>)<SUB>2</SUB>, where L=pyridine <I>N</I>-oxide and γ-picoline <I>N</I>-oxide, have been obtained. The preparation of hexa(γ-picoline <I>N</I>-oxide) copper(II) perchlorate is reported. The solution and frozen solution spectra indicate a very similar bonding in all the complexes, with moderately ionic metal-oxygen. The powder spectra reveal all the tetrakis complexes to be axially symmetric; though tetra(γ-picoline <I>N</I>-oxide) copper(II) perchlorate shows a reversal of the usual order of the <I>g</I>-values. This is explained in terms of the packing interactions within the crystal structure, rather than metal-ligand interaction. All the single crystal spectra are characteristic of axially symmetric complexes. Hexa(pyridine <I>N</I>-oxide)copper(II) perchlorate gives an isotropic ESR spectrum, but this does not seem to be due to exchange interaction. Hexa(γ-picoline <I>N</I>-oxide)copper(II) perchlorate gives an axial ESR spectrum with a considerable tetragonal misalignment.
- 公益社団法人 日本化学会の論文
著者
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MISUMI Seizo
Inorganic Chemistry Laboratory, Faculty of Science, Kushu University
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Freyberg Derek
Inorganic Chemistry Laboratory, Faculty of Science, Kyushu University
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Isobe Toshiyuki
Inorganic Chemistry Laboratory, Faculty of Science, Kyushu University
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