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Abstract
The reaction of Ni(II), Zn(II), Cd(II), Fe(III) and La(III) ions with sodium penicillinate at room temperature has allowed the isolation of two types of complexes with the following general formulae: M(pen)2 · nH2O (M = Ni(II), Zn(II), Cd(II); n = 3,4) and M(pen)2 · Cl · nH2O (M = Fe(III), La(III); n = 2). The complexes were characterized by physjcochemical and spectroscopic methods. A monomeric structure is proposed with octahedrally coordinated metals ions. The divalent ions are coordinated through the amide and β-lactam carbonyls and a car-boxylate group from penicillin while the trivalent ions are coordinated through the carboxylate group and the amide carbonyl only.