Potassiumcis-[(R)-aspartato(2–)][(S)-aspartato(2–)]cobaltate(III) 3.5-hydrate at 120 K

Abstract

The title compound, K[Co(C4H4NO4)2]3.5H2O, is a by‐product resulting from adventitious oxidation, in the presence of racemic aspartic acid, of cobalt(II) in a cobaltous starting material. The presence of both enanti­omeric forms of the tridentate aspartate ligand in the cobaltate anion is significant in eliminating the possibility of the existence of isomeric forms of the cis(N) isomer.