The synthesis and X-ray structure of (L- or D-alanine-N-acetato)(L-histidinato)chromium(III).

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概要

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• The (L-alanine-<I>N</I>-acetato)(L-histidinato)chromium(III) monohydrate complex, C<SUB>11</SUB>H<SUB>14</SUB>N<SUB>4</SUB>O<SUB>6</SUB>Cr, has been synthesized and its crystal structure has been determined from three dimensional X-ray-diffractometer data. The crystals are orthorhombic, of the space group P2<SUB>1</SUB>2<SUB>1</SUB>2<SUB>1</SUB>, with 4 molecules in a cell with these dimensions: <I>a</I>=11.052(1), <I>b</I>=13.959(3), and <I>c</I>=9.616(2) Å. Block-diagonal least-squares refinements using 1318 independent nonzero reflections have yielded a conventional <I>R</I> factor of 0.033. The structure consists of monomeric [Cr(L-alama)(L-his)] units and water molecules. The L-alama ligand coordinates to the metal as of dianion, with Cr–O(acetyl), Cr–N, and Cr–O(alanine) bond lengths of 1.960(3), 2.078(5), and 1.946(4) Å respectively. The histidinate monoanion coordinates through Cr–N(amino), Cr–N(imidazole), and Cr–O bonds 2.062(4), 2.036(5), and 1.957(4) Å long respectively. The geometry at chromium is a distorted octahedron, with <I>cis</I> bond angles in the range from 80.1(2) to 99.3(2)°. Among the six possible isomers of the [Cr(L-alama)(L-his)] complex, only one isomer was prepared and crystallized; its geometry was R-L-<I>trans</I>(<I>O</I>)<I>cis</I>(<I>N</I>).

• 公益社団法人 日本化学会の論文

著者

• Kosaka Masao

  Kogakuin Univ.

• Kosaka Masao

  Kogakuin University

• Sato Mitsunobu

  Kogakuin University

• Watabe Masatoshi

  Kogakuin University

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• The synthesis and X-ray structure of (L- or D-alanine-N-acetato)(L-histidinato)chromium(III).

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