Metallkomplexe in Biologie und Medizin, V. Neue Hydroxycarboxylat‐Komplexe von Bismut. Synthese und Struktur von Bismut(III)‐malat‐monohydrat und Bismut(III)‐tartrat‐trihydrat

Metal Complexes in Biology and Medicine, V. — 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.