Stereochemistry and reactivity of metal-schiff-base complexes. I. Preparation and thermodynamic stereoselectivity of mixed ligand cobalt(III) complexes containing N,N'-ethylenebis(salicylideneamine) dianion (sal2en) or (7,7'-Me-sal2en) and L-amino acid an

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概要

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• Two series of new mixed ligand cobalt (III) complexes with the general formulas of [Co(sal<SUB>2</SUB>en)(L-aa)] and [Co(7,7′-Me-sal<SUB>2</SUB>en)(L-aa)] (where L-aa=anion of L-ala, L-val, L-leu, L-isoleu, L-met, L-thr, L-phe, L-tyr, or L-trp) have been prepared and characterized. All are labile for both isomerization and substitution reactions and each exists in an equilibrium mixture of <I>Λ</I><SUB>L</SUB>- and <I>Δ</I><SUB>L</SUB>-<I>cis</I>-β<SUB>1</SUB>(fac)-isomers (<I>Λ</I><SUB>L</SUB>><I>Δ</I><SUB>L</SUB>)in methanol. The isomer's ratios, <I>Λ</I><SUB>L</SUB>/<I>Δ</I><SUB>L</SUB> were estimated from their PMR spectra, and the following facts were found: The increasing order of the ratios is L-ala∼L-met∼L-leu<L-val<L-isoleu<L-thr<L-phe∼L-tyr<L-trp, and the ratios are larger in 7,7′-Me-sal<SUB>2</SUB>en-complexes than in sal<SUB>2</SUB>en-complexes for each amino acid.

• 公益社団法人 日本化学会の論文

著者

• Isago Takashi

  Department Of Chemistry College Of Science And Engineering Aoyama Gakuin University

• Fujii Yuki

  Department Of Chemistry Faculty Of Science Ibaraki University

• Sano Mitsuo

  Department Of Applied Chemistry Faculty Of Science And Engineering Kinki University

• FUJII Yuki

  Department of Chemistry, Faculty of Science, Ibaraki University

• Takahashi Sozo

  Department of Chemistry, Ibaraki Technical College

• Yanagibashi Noriko

  Department of Chemistry, Faculty of Science, Ibaraki University

• Hirasawa Shigeru

  Department of Chemistry, Faculty of Science, Ibaraki University

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