Synthetic, spectroscopic and X-ray crystallographic studies of bivalent metal complexes with amino acids having a thiazolidine ring. I. Properties of bivalent metal complexes with 4-Thiazolidinecarboxylic acid and the structure of chloro(4-thiazolidine-ca

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概要

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• Complexes of five bivalent metals with (<I>S</I>)-4-thiazolidinecarboxylic acid((<U>Remark: Graphics omitted.</U>)) have been prepared by three methods and characterized by means of infrared absorption, reflection spectra, magnetic susceptibility, thermal analysis, powder X-ray patterns, and single crystal X-ray diffraction. Two types of complexes were found. The first type[A] included ML<SUB>2</SUB>·<I>n</I>H<SUB>2</SUB>O (M=Co(II), Ni(II), Cu(II), Zn(II), Cd(II); L=(<I>S</I>)-4-thiazolidinecarboxylate anion) and ZnClL(HL) was the second type[B]. In A-type complexes, the ligand coordinates to the metal with a nitrogen atom and an oxygen atom. From the results of single-crystal X-ray diffraction studies, the second type-B ZnClL(HL) was found to be orthorhombic, with the space group <I>P</I>2<SUB>1</SUB>2<SUB>1</SUB>2<SUB>1</SUB>; <I>a</I>=9.719(2), <I>b</I>=22.194(4), <I>c</I>=5.8537(5) Å, <I>U</I>=1262.6(4) Å<SUP>3</SUP>, <I>Z</I>=4, <I>D</I><SUB>m</SUB>=1.91 Mg m<SUP>−3</SUP>, <I>D</I><SUB>x</SUB>=1.93 Mg m<SUP>−3</SUP>, and μ(Mo <I>K</I> α)=25.3 cm<SUP>−1</SUP>. Block-diagonal least-squares refinements have led to a final <I>R</I> value of 0.045. The zinc atom is penta-coordinated, being ligated with one carboxylate oxygen atom of (<I>S</I>)thiazolidinium-4-carboxylate, which has a zwitter ion structure, two carboxylato oxygen atoms and one nitrogen atom of (<I>S</I>)-4-thiazolidinecarboxylate anion, and a chloride atom. The structure comprises onedimensional polymers by the carboxylate oxygen atom of this anion-type ligand. The plane extends in the direction of c-axis. In neither the A- nor the B-type complexes does the ligand coordinate to a metal with a sulfur atom.

• 公益社団法人 日本化学会の論文

著者

• Takeuchi Toshio

  Department Of Aquatic Biosciences Faculty Of Fisheries Tokyo University Of Fisheries

• Yukawa Yasuhiko

  Department of Chemistry, Faculty of Science and Technology, Sophia University

• Nagase Makoto

  Department of Natural Sciences, Faculty of Science and Technology, Sophia University

• Inomata Yoshie

  Department of Natural Sciences, Faculty of Science and Technology, Sophia University

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