Acta Crystallographica Section C

Volume 66, Part 11 (November 2010)

metal-organic compounds

 

Diastereoisomeric -ethyl aspartate-cobalt(III) complexes: (+)₅₇₈- and (-)₅₇₈-bis(ethane-1,2-diamine)[-ethyl (S)-aspartato]cobalt(III) bis(perchlorate) monohydrate

A. Hammershøi, M. Schau-Magnussen, J. Bendix and A. Mølgaard

Abstract: The structures of the diastereoisomers (+)₅₇₈-, (I), and (-)₅₇₈-bis(ethane-1,2-diamine)[-ethyl (S)-aspartato-²N,O¹]cobalt(III) bis(perchlorate) monohydrate, (II), both [Co(C₆H₁₀N₂O₄)(C₂H₈N₂)₂](ClO₄)₂·H₂O, are compared. In both structures, the ester group of the amino acid side chain is engaged only in intramolecular hydrogen bonding to coordinated amine groups. This interaction is stronger in (I) and correlates with previously observed diastereoisomeric equilibrium ratios for related metal complex systems in aqueous media. The two perchlorate anions of (II) are located on twofold axes. Both perchlorates in (I) and one of the perchlorates in (II) are affected by disorder. Both structures exhibit extensive three-dimensional hydrogen-bonding networks.

Formula: Diastereoisomers of [Co(C₆H₁₀N₂O₄)(C₂H₈N₂)₂](ClO₄)₂·H₂O

	Structure factor file (CIF format) (244.4 kbytes) [ doi:10.1107/S0108270110036851/lg3040Isup2.hkl ] Contains datablock I
	Structure factor file (CIF format) (235.8 kbytes) [ doi:10.1107/S0108270110036851/lg3040IIsup3.hkl ] Contains datablock II

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