Structures and Properties of Vanadium(III) Complexes with 1,2-Diaminoethane-<i>N</i>,<i>N</i>′-diacetate-<i>N</i>,<i>N</i>′-dipropionate and <i>N</i>,<i>N</i>-Bis(carboxymethyl)-<i>β</i>-alanate

Abstract

Abstract The crystal structures of K[V(eddda)]·2H2O (1) and [V(β-alada)(H2O)2]·H2O (2) were determined by X-ray crystallography, where eddda and β-alada denote 1,2-diaminoethane-N,N′-diacetate-N,N′-dipropionate and N,N-bis(carboxymethyl)-β-alanate, respectively. The crystal of 1 is monoclinic, space group P21/n, a = 10.2753(8), b = 11.3007(8), c = 15.278(2) Å, β = 104.857(9)°, V = 1714.7(3) Å3, Z = 4, and R = 0.052. The crystal of 2 is orthorhombic, space group P212121, a = 7.451(1), b = 11.852(2), c = 13.403(2) Å, V = 1183.6(3) Å3, Z = 4, and R = 0.053. Complexes 1 and 2 adopt a hexacoordinate structure in contrast to the heptacoordinate one of the closely related ethylenediamine-N,N,N′,N′-tetraacetate and nitrilotriacetate complexes. Complexes 1 and 2 yield oxo-bridged dinuclear complexes upon base hydrolysis. The reaction of 2 with CO32− results in the formation of the heptacoordinate species with the bidentate carbonato ligand.