Abstract
Despite the importance of V III in biology, only three V III complexes of naturally occurring amino acids have been structurally characterized. We report the structure of the first vanadium complex incorporating a glycine ligand, [V(Gly) 3] · 2DMSO, which crystallizes in a monoclinic system with space group Cc, a = 8.9186(5) Å, b = 21.5347(9) Å, c = 9.9064(5) Å and β = 110.536(3)°. The X-ray structural data show the central V III metal octahedrally coordinated by three bidentate glycinato ligands arranged a mer configuration, with both Δ and Λ enantiomers present in the unit cell. The bulk sample was isolated as [V(Gly) 3] · DMSO · NaCl. Structural comparisons are made with the corresponding homoleptic glycinato complexes of Co III, Cr III and Ni II. The structure of trans-[V(OH 2) 4Cl 2]Cl · 2H 2O has also been re-determined. This latter complex crystallizes in a monoclinic system in the P2(1)/ c space group, a = 6.4381(9) Å, b = 6.3843(9) Å, c = 11.7980(17) Å and β = 98.057(2)°. The vanadium atom lies at a crystallographic inversion centre within the distorted octahedron formed by the four water and two chloride ligands.
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