Salicylideneserinato complexes of vanadium. Crystal structure of the sodium salt of a complex of vanadium-(IV) and -(V)
Abstract
A mixed-valence complex of vanadium-(IV) and -(V). Na[V2O3(DL-salser)2]·5H2O (salser =N-salicylideneserinate) has been isolated from solutions containing oxovanadium(IV), DL-serine and salicylaldehyde. Its structure has been determined by X-ray diffraction analysis: space group P21/c, a= 12.845(5), b= 16.615(4), c= 13.072(0)Å, β= 103.53(9)°, Z= 4 and R= 0.0494 for 2860 observed reflections. The V2O33+ unit in this complex has a V–O–V angle smaller than the usual values and each complex ion contains a D- and a L-serine residue. Each sodium ion is surrounded by seven oxygen atoms in a distorted pentagonal-bipyramidal geometry. The magnetic moment and thermogravimetric analysis are also in accord with the structure.