Mixed-Ligand Complexes of Co(II) and Co(Iii) with Tetra-Or Octaazamacrocycles and a Bicyclic Dicarboxylate Ligand

Abstract

Abstract Two cationic mixed-ligand complexes, [Co(L)cyc]NO3 C2H5OH (A) and [Co2(L)tpmc](CJO4)2 CH3CN (B), were prepared, where eye = 1, 4, 8, 11-tetraaza-cyclotetradecane, tpmc = N, N′, N″, N′″-tetrakis(2-pyridylmethyl)-1, 4, 8, 11-tetraaza-cyclotetradecane and L = bicyclo[2. 2. 1]-hept-5-en-endo-2, 3-cis-dicarboxylate dianion. The complexes were characterized by elemental analyses, ion-exchange chromatography, magnetic moments, conductance measurements, IR, 13C NMR and UV/VIS spectroscopy and cyclic voltammetry. It is suggested that the complexes A and B have octahedral structures with endobidentate or exo-(bis)-bidentate coordination of L.