Poly(dl-aspartic acid) and copper(II) acetate monohydrate interactions

A polychelate with poly(dl-aspartic acid) was prepared in order to study the influence of the polymer ligands on the copper(II) acetate monohydrate. This compound was characterized by elemental analysis, magnetic susceptibility measurements, spectroscopy and thermal analysis. It is suggested that in the unit Cu₂(acetate)₄ the breakage of two acetate groups occurs by the effect of polymer ligand group coordination. It coordinates through a carboxylate group, keeping the water molecules coordinated to Cu^II. A magnetic moment of the polychelate is observed which presents a value of 1.74 M.B, which corresponds to uncorrelated Cu²⁺ (S = 1/2) spins, separated by large Cu–Cu distances. According to the suggested structure, PM3 semi-empirical calculations of the polychelate of Cu^II were done.