Crystal structures of mixed ligand copper(II) complexes containing L-amino acids. I. L-asparaginato-L-histidinatocopper(II) and its hydrate.

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概要

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• Two copper complexes containing L-histidine and L-asparagine crystallize from aqueous solution at pH 7.0. Both crystals are monoclinic, space group P2<SUB>1</SUB>. L-Asparaginato-L-histidinatocopper(II): <I>a</I>=10.913(3), <I>b</I>=12.911(4), <I>c</I>=10.206(3) Å, β=113.83(2)°, <I>Z</I>=4. L-Asparaginato-L-histidinatoaquacopper(II) trihydrate: <I>a</I>=12.654(4), <I>b</I>=11.623(4), <I>c</I>=5.931(2) Å, β=100.47(3)°, <I>Z</I>=2. In both structures, four coordinating atoms in an approximately planar arrangement around copper are the α-amino and imidazole δ-nitrogen atoms of L-histidine and α-amino nitrogen and α-carboxyl oxygen of L-asparagine. The fifth coordination site is occupied by the α-carboxyl oxygen of L-histidine. Difference between the two complex crystals is found at the sixth coordination site; a water molecule is coordinated in the hydrated crystal to complete a distorted octahedral environment, while in the anhydrous crystal this site is unoccupied so that the geometry of the complex is square-pyramidal.

• 公益社団法人 日本化学会の論文

著者

• Nakahara Akitsugu

  Institute Of Chemistry College Of General Education Osaka University

• Sakurai Takeshi

  Institute For Molecular Science

• Ono Taizo

  Laboratory of Chemistry for Natural Products, Tokyo Institute of Technology

• Sasada Yoshio

  Laboratory of Chemistry for Natural Products, Faculty of Science, Tokyo Institute of Technology

• Yamauchi Osamu

  Institute of Chemistry, College of General Education, Osaka University

• Shimanouchi Hirotaka

  Laboratory of Chemistry for Natural Products, Tokyo Institute of Technology

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