Synthesis and crystal structure of potassium triethylenetetraaminehexaacetatodi [oxo-vanadium(IV)] hexahydrate, K-2[V2O2(ttha)]center dot 6(H2O)
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The title complex, potassium triethylenetetraaminehexaacetatodi [oxo-vanadium (IV)] hexahydrate K-2[V2O2(ttha)].6(H2O), was synthesized in aqueous solution and its crystal structure has been determined by X-ray diffraction. The complex belongs to a triclinic system, space group P (1) over bar with a = 6.645(1), b = 9.870(2), c = 13.263(3) Angstrom, alpha = 70.68(3), beta = 76.27(3), gamma = 71.66(3)degrees, V = 770.5(3) Angstrom(3), M-r = 808.58, D-c = 1.743 g/cm(3), Z = 1, mu = 0.968 mm(-1), lambda(MoKalpha) = 0.71073 Angstrom and F(000) = 416. The final R = 0.0465 and wR = 0.1091 for 2974 observed diffractions with I greater than or equal to 2sigma(I). In the complex, the V atom is octahedrally coordinated to the oxo ligand, two N and three 0 atoms of the triethylenetetraaminehexaacetic (TTHA) ligand. All of the ten chelating sites are coordinated to the two vanadium atoms, and the coordination octahedron is distorted. Each [V2O2(ttha)](2-) ion is further connected by the K+ ions through carboxyl groups of TTHA(6-) ion, forming a two dimensional network structure.