The coordinative sites of bispyrydilamide ligand are composed of amide nitrogens as ? donor and pyridine nitrogens as ? donor and ? acceptor atoms. Tuning of charge density on central metal has a significiant effect on the role plaied by a complex as catalyst, enzyme model or other applications. The electronic properties and stabilization of the desired oxidation state of a metal ion can conveniently be modified by choosing the suitable diamine or using quinaldic acid derivates with suitable substituents. In this thesis, the synthesis of the new ligand H 2 Mebqb and its complexes [M II (Mebqb)] (I-IV) and [N(n-Bu) 4 ][Co II (Mebqb)(X) 2 ] (V-VI), which may have biochemical and photochemical applications, are reported. V) [N(n-Bu) 4 ][Co(Mebqb)(N 3 ) 2 ] I) [Co(Mebqb)] VI) [N(n-Bu) 4 ][Co(Mebqb)(CN) 2 ] II) [Ni(Mebqb)] III) [Cu(Mebqb)] IV) [Cd(Mebqb)] The fused phenyl rings in the structure of H 2 Mebqb, as compared with that of H 2 Me, increase the ? accepting character of H 2 Mebqb. Changes In the electronic properties can also affect the reactivity of the central metal ion. Conrary to the Me cobalt complexes, only complexes (V) and (VI) were successfully synthesized, using two ? donor and ? acceptor ligands (CN - and N 3 - ) in the axial positions. In addition, The steric demands of the ligand, led to the formation of [Ni(Mebqb)] with a distorted square planar structure. Due to the steric hindrance imposed by the Mebqb ligand, the structure of Co(III) complexes is also, distorted octahedral. The methyl group on benzene ring in the structure of H 2 Mebqb, as compared with H 2 bqb and H 2 cbqb, increases the solubility of the complexes, making it possible to obtain the 1 HNMR spectrum of Cd complex in DMSO, the electronic spectrum of Ni complex in chloroform and to investigate the electrochemical properties of Ni(II) and Co(III) compounds.
