The favorable characteristics of ionic liquids make them promising substitutes for efficiency in organic and inorganic synthesis. The coordinative sites of bispyrydilamide ligand are composed of amide nitrogens as ? donor and pyridine nitrogens as ? donor and ? acceptor atoms. The deprotonated amide is a strong ?-donor capable of stabilizing early as well as late metal ions in high oxidation states, making high-valent metal complexes of the ligands suitable as Lewis acid catalysts, 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 suitable diamines or using quinaldic acid derivates with suitable substituents. In this project the synthesis of the ligand H 2 Me 2 bqb with ionic liquid ( TBAB ) as reaction media and catalyst and its complexes (I-V) with possible bio- and electro- or photochemical applications have been discussed. III) [N(n-Bu) 4 ][Co(Me 2 bqb)(N 3 ) 2 ] I) [Ni(Me 2 bqb)] IV) [N(n-Bu) 4 ][Co(Me 2 bqb)(CN) 2 ] II) [Cu(Me 2 bqb)] V) [N(n-Bu) 4 ][Co(Me 2 bqb)(SCN) 2 ] The two methyl group on benzene ring in the structure of H 2 Me 2 bqb, as compared with H 2 bqb, H 2 Mebqb and H 2 cbqb, leads to different properties such as solubility, electrochemical behavior, and spectral characteristics Ni(II) and Co(III) compounds. The H 2 Me 2 bqb and its complexes were characterized by UV-Vis, FT-IR, 1 HNMR and elemental analysis. NiMe 2 bqb was structurally characterized by X-Ray Diffraction. The electrochemical properties of ligand and complexes (I), (III), (IV) and (V) were also investigated by cyclic voltammetry , and the trend in the observed redox potential was rationalized considering the axial ligand properties and the structure of the equatorial ligand on the redox potential of these complexes. The steric demands of the ligand, led to the formation of [Ni(Me 2 bqb)] with a distorted square planar structure. Due to the steric hindrance imposed by the H 2 Me 2 bqb ligand, the structure of Co(III) complexes is also, distorted octahedral .
