Cu(II) complexation with his-gly and his-ala.: X-ray structure of [Cu(his-gly)2(H2O)2•]6H2O

Two novel Cu(II)-dipeptide complexes containing L-histidyl-L-glycine and L-histidyl-L-alanine as ligands were prepared and characterised by infrared and electronic spectroscopies. EPR measurements were also made in solution and in the solid state. Cyclic voltammetric studies were carried out on aqueous solution. The crystalline structure of the [CU(L-histidyl-L-glycine)(2)(H2O2)(2)](.)6H(2)O was determined by X-ray diffractometry. It crystallises in the space group C2. The Cu(II) is in a tetragonally distorted octahedral coordination, where the basal plane is occupied by N-atoms belonging to the histidine portion. The apical positions are occupied by two molecules of water. (C) 2003 Elsevier B.V. All rights reserved.