Synthesis and stereoselectivity of cobalt(III) complexes of quadridentate ligands possessing SNNS array of donor atoms.

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概要

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• Several thiolato complexes of [Co(SNNS)(diamine)]<SUP>+</SUP> type were prepared (diamine stands for en=1,2-ethanediamine, <I>R</I>-pn=(<I>R</I>)-1,2-propanediamine, and <I>RR</I>-chxn=(<I>R</I>,<I>R</I>)-1,2-cyclohexanediamine) and characterized from their visible–UV absorption, circular dichroism, and <SUP>13</SUP>C NMR spectra, where SNNS denotes two kinds of open-chain quadridentate ligands, H<SUB>2</SUB>endet=3,6-dimethyl-3,6-diazaoctane-1,8-dithiol and <I>R</I>-H<SUB>2</SUB>pndet=(<I>R</I>)-3,4,6-trimethyl-3,6-diazaoctane-1,8-dithiol. Both the SNNS ligands gave the two geometrical isomers, <I>cis</I>-α(dark green) and <I>cis</I>-β(dark violet), whereas 3,7-dimethyl-3,7-diazanonane-1,9-dithiolate(2–) ligand gave no stable monomeric complex. Interestingly, stereoselective complex formation was found in <I>Δ</I>-<I>cis</I>-α-[Co(<I>R</I>-pndet)(en or <I>RR</I>-chxn)]<SUP>+</SUP>, <I>Δ</I>(<I>S</I><SUP>N</SUP><I>R</I><SUP>N</SUP>)-<I>cis</I>-β-[Co(endet)(<I>R</I>-pn or <I>RR</I>-chxn)]<SUP>+</SUP>, and <I>Δ</I>(<I>S</I><SUP>N</SUP><I>R</I><SUP>N</SUP>)-<I>cis</I>-β-[Co(<I>R</I>-pndet)(en or <I>RR</I>-chxn)]<SUP>+</SUP>, the <I>Δ</I>-<I>cis</I>-α configuration of the former complex being the novel one having the equatorially-oriented terminal chelate rings on the tertiary nitrogen atoms.

• 公益社団法人 日本化学会の論文

著者

• Takeshita Norimatsu

  Department Of Agricultural Chemistry Faculty Of Agriculture Kyoto University:(present)high Quality L

• Yamanari Kazuaki

  Department Of Chemisry Faculty Of Science Osaka University

• Shimura Yoichi

  Department of Chemistry Faculty of Science Osaka University

• Takeshita Norimatsu

  Department of Chemistry, Faculty of Science, Osaka University

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