New macrocyclic Cu(II) complexes with leucine/isoleucine co-ligands

Abstract

Two new bridged dinuclear Cu(II) compounds of tpmc (N,N',N'',N'''-tetrakis(2-pyridylmethyl)- 1,4,8,11-tetraazacyclotetradecane) and co-ligands L-leucine or L-isoleucine have been synthesized and characterized. The complexes were prepared in the reaction [Cutpmc](ClO4)4∙6H2O and aminocarboxylates. The complexes were characterized by elemental analysis (C, H, and N), molar electrical conductivity and spectral methods (UV/vis and FTIR). The analytical data of the complexes show the formation of binuclear complexes with the proposed formula [Cu2(L)tpmc](ClO4)4, L=L- leucine (1) and L=L-isoleucine (2). The spectroscopic data suggested that the tpmc is coordinated to Cu(II) through eight N donors and amino carboxylate ligands via their carboxylate ion moieties.