Abstract
(+)589-Bis(L-ornithinato)cobalt(III) nitrate monohydrate was isolated by ion-exchange chromatography from a reaction mixture of trinitratotriamminecobalt(III) with L-ornithine at pH 9, and was assigned to the cis-(O)trans(Nα)cis(Nδ) isomer on the basis of the absorption and circular dichroism spectra. Then, the geometry of the complex was confirmed by X-ray structure analysis. The red crystal is orthorhombic, with these cell dimensions: a=14.380, b=16.493, and c=6.787 A. The space group is P212121, and Z=4. The crystal structure was solved by the Patterson and Fourier techniques and was refined by the least-squares method to R 0.099. The Co atom is surrounded by 2 O and 4 N atoms, the former being in cis positions. Each of the L-ornithinato ligands assumes the facial coordination, and the complex cation has an approximate two-fold axis by which the ligand are correlated.
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