IR, EPR And Electronic Spectroscopic Characterization Of A 3D Series Of Manganese And Copper Metal Complexes

Macrocyclic complexes and their chemistry is a growing area of research in inorganic and bioinorganic chemistry in point of its biological significance [1]. Macrocyclic complexes have also received special attention because of their mixed soft –hard donor acceptor character and versatile coordination behavior and their pharmacological properties [2]. Macrocyclic ligands and complexes have versatile coordination behavior [3] and anti microbial, anti cancer, antiviral, anti-inflammatory, antioxidant and antitumor [4]. The formation of macrocyclic complexes depends on the size of macrocycle, nature of its donor atoms and on the complex behavior of anions involved in the coordination[5]. Transtion metal ions are selective in chelation to macrocyclic ligands depending on the number, type and position of their donor atoms, the ionic radius of metal ion and coordination properties of counter ions[6]. Macrocyclic ligands and their complexes contains aza units which forms a strong chelate ring giving possible electron delocalization associated with extended conjugation that may affect the nature of the complex formed[7]. This paper describes synthesis and characterization of macrocyclic complexes of Mn(II) and Cu(II) derived from 2,6 diammino pyridine and ethylene diammine using thiodiglycolic acid.