METAL-COMPLEXES IN BIOLOGY AND MEDICINE .5. NEW BISMUTH HYDROXYCARBOXYLATE COMPLEXES - SYNTHESIS AND STRUCTURE OF BISMUTH(III) MALATE MONOHYDRATE AND BISMUTH(III) TARTRATE TRIHYDRATE

Reaction of Bi(NO3)3 . 5 H2O with L-(-)-malic acid results in the formation of bismuth(III) malate monohydrate Bi[O2CCH2CH(O)CO2] . H2O (1) containing the tridentate ligand [L-(-)-malate]3- with all donating functions deprotonated. By way of contrast, reaction of Bi(NO3)3 . 5 H2O with L-(+)-tartraic acid gives bismuth(III) tartrate trihydrate (2), in which two different tartrate ligands, [L-(+)-tartrate]1- and [L-(+)-tartrate]2- are present. The solid-state structures have been determined by single-crystal X-ray methods and confirmed by powder diffraction measurements. The structure analyses exhibit a three-dimensional network in the crystalline state resulting from bridging and chelating properties of the polydentate hydroxycarboxylate ligands. Bismuth shows high coordination numbers.