EPR STUDY OF THE 1-1 COMPLEXES OF CHROMIUM(III) AND COPPER(II) WITH 5'-GMP AND 5'-CMP

EPR investigation of Cr(III) and Cu(II) complexes with 5'-GMP and 5'-C MP gives information concerning the metal-nucleotide interaction and t he symmetry of the coordination polyhedra. The interaction of Cr(III) with these nucleotides occurs mainly through the phosphate group in a pseudooctahedral geometry. In the case of Cu(II)-com plexes a dominant interaction of the metal with heterocyclic rings is observed. The pho sphate group is also involved in these interactions. A local square-py ramidal symmetry occurs for both copper complexes Cu(II)-5'-CMP and Cu (II)-5'GMP, but the latter presents a rhombic distorted geometry. (C) 1997 Elsevier Science B.V.