Moessbauer emission spectroscopic study of some spin crossover cobalt(II) complexes.
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概要
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The Mössbauer emission spectra of [<SUP>57</SUP>Co(terpy)<SUB>2</SUB>]X<SUB>2</SUB> (X=Cl and ClO<SUB>4</SUB>), [<SUP>57</SUP>Co(snn)<SUB>2</SUB>](ClO<SUB>4</SUB>)<SUB>2</SUB>, and [<SUP>57</SUP>Co(snnme)<SUB>2</SUB>](ClO<SUB>4</SUB>)<SUB>2</SUB> (terpy=2,2′ : 6′2″-terpyridine, snn=<I>N</I>-(2-pyridylmethylene)-2-(methylthio)aniline, and snnme=<I>N</I>-(6-methyl-2-pyridylmethylene)-2-(methylthio)aniline) were examined. These cobalt complexes show thermally induced spin crossover behavior and the temperature dependence of their magnetic moment varies with the counter anion, although the corresponding iron complexes are in a low-spin state. The high-spin iron(II) species ascribed to a metastable form are observed in the emission spectra of [<SUP>57</SUP>Co(terpy)<SUB>2</SUB>](ClO<SUB>4</SUB>)<SUB>2</SUB>·2H<SUB>2</SUB>O and [<SUP>57</SUP>Co(snnme)<SUB>2</SUB>](ClO<SUB>4</SUB>)<SUB>2</SUB>, and their spectral areas increase with decreasing source temperature. The effective vibrating mass for the iron complex observed in the emission spectra of [<SUP>57</SUP>Co(snnme)<SUB>2</SUB>](ClO<SUB>4</SUB>)<SUB>2</SUB> was calculated from the temperature dependence of the isomer shift value, and was used to distinguish whether the iron complex formed by EC-decay of a cobalt-57 atom is stable or metastable.
- 公益社団法人 日本化学会の論文
著者
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Maeda Yonezo
Department Of Chemistry And Physics Graduate School Of Sciences Kyushu University
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Takashima Yoshimasa
Department Of Chemistry Faculty Of Science Kyushu University
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Maeda Yonezo
Department of Chemistry, Faculty of Science, Kyushu University 33
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Ohshio Hiroki
Department of Chemistry, Faculty of Science, Kyushu University 33
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Ohshio Hiroki
Department of Chemistry, Faculty of Science, Kyushu University
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