Transition metal complexes of 13- and 14-membered N2O2 macrocycles: synthesis and characterization

摘要

Two novel series of 13- and 14-membered diazadioxamacrocyclic complexes [ML1Cl2] and [ML2Cl2] (M=Co2+, Ni2+, Cu2+, and Zn2+) have been synthesized via the condensation reaction of o-aminophenol and 1,2-dibromoethane with a dialdehyde or a diketone in the presence of transition metal ions as templates in ethanol. The mode of bonding and overall geometry of the complexes have been inferred through IR, 1H NMR, EPR, and electronic spectral studies, conductivity, and magnetic moment measurements. An octahedral geometry is proposed for all the complexes.