STRUCTURES AND PROPERTIES OF VANADIUM(III) COMPLEXES WITH 1,2-DIAMINOETHANE-N,N'-DIACETATE-N,N'-DIPROPIONATE AND N,N-BIS(CARBOXYMETHYL)-BETA-ALANATE

The crystal structures of K[V(eddda)]. 2H(2)O (1) and [V(beta-alada)(H 2O)(2)]. H2O (2) were determined by X-ray crystallography, where eddda and beta-alada denote 1,2-diaminoethane-N,N'-diacetate-N,N'-dipropion ate and N,N-bis(carboxymethyl)-beta-alanate, respectively. The crystal of 1 is monoclinic, space group P2(1)/n, a=10.2753(8), b=11.3007(8), c=15.278(2) Angstrom, beta=104.857(9)degrees, V=1714.7(3) Angstrom(3), Z=4, and R=0.052. The crystal of 2 is orthorhombic, space group P2(1) 2(1)2(1), a=7.451(1), b=11.852(2), c=13.403(2) Angstrom, V=1183.6(3) A ngstrom(3), Z=4, and R=0.053. Complexes 1 and 2 adopt a hexacoordinate structure in contrast to the heptacoordinate one of the closely relat ed ethylenediamine-N,N,N',N'-tetraacetate and nitrilotriacetate comple xes. Complexes 1 and 2 yield ore-bridged dinuclear complexes upon base hydrolysis. The reaction of 2 with CO32- results in the formation of the heptacoordinate species with the bidentate carbonate ligand.