Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1310129 | Inorganica Chimica Acta | 2008 | 6 Pages |
Despite the importance of VIII in biology, only three VIII 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 VIII 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 CoIII, CrIII and NiII. The structure of trans-[V(OH2)4Cl2]Cl · 2H2O 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.
Graphical abstractThe synthesis and structure of the first vanadium complex incorporating glycine, mer [VIII(Gly)3] · DMSO, is presented. The structure of trans-[VIII(OH2)4Cl2]Cl · 2H2O has also been re-determined. This latter complex immediately forms upon dissolving the widely used VIII reagent VCl3 in aqueous solution.Figure optionsDownload full-size imageDownload as PowerPoint slide