Structural study of optical resolution. IX. The crystal structure of (-)589-tris(biguanide)cobalt(III) chloride d-tartrate pentahydrate.

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概要

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• The crystal structure of the less-soluble diastereomeric salt, (−)<SUB>589</SUB>-[Co(Hbg)<SUB>3</SUB>]Cl(<I>d</I>-tart)·5H<SUB>2</SUB>O, has been determined by X-ray analysis (<I>R</I>=0.056, 1277 reflections). The crystals are orthorhombic, with the space group of C222, <I>Z</I>=4, <I>a</I>=24.846(5), <I>b</I>=12.970(2), and <I>c</I>=8.645(2) Å. The main features of the crystal structure are as follows: (1) The complex cation and Cl<SUP>−</SUP> anion are arranged alternately along the b-axis to form an infinite spiral chain. The distances between N(Hbg) and Cl are 3.452 and 3.376 Å. (2) The tartrate ions exist as a dimeric unit whose structure closely resembles that of [Sb<SUB>2</SUB>(d-tart)<SUB>2</SUB>]<SUP>2−</SUP>. Through the center of this dimeric unit pass three mutually orthogonal twofold axes. (3) There are short contacts between the Hbg ligands and the tartrate ions along the twofold axis of the complex; N(A2)···OT3 2.862, N(B2)···OT2 3.116, N(B3)···OT2 2.754, and N(B4)···OT1 2.963 Å. On the basis of these features, the chiral discrimination mechanism is discussed.

• 公益社団法人 日本化学会の論文

著者

• YONEDA Hayami

  Department of Chemistry, Faculty of Science, Hiroshima University

• Kushi Yoshihiko

  Department Of Chemistry Graduate School Of Science Osaka University

• Tada Toshiji

  Department Of Biological Science Graduate School Of Science Osaka Prefecture University

• Tada Toshiji

  Department of Chemistry, Faculty of Science, Hiroshima University

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