A Comparative Study of Microwave Assisted and Conventional Synthesis of Mixed Ligand Complexes with Cr(III), Co(II), Ni(II) Cu(II) and Cd(II)

The primary ligand 2-amino acetic acid -6- chloro benzothiazole (L) was prepared as a chelating ligand, which was treated with the ions Cr(III), Co(II), Ni(II) Cu(II) and Cd(II) in alcoholic medium in order to prepare series of new metal complexes in presence of the co-ligand 2,2`-bipyridyl (L ).These complexes were prepared by conventional and microwave methods and characterized by the available techniques. FT-IR, UV-Visible, magnetic susceptibility, flame atomic absorption technique as well as elemental analysis and coductivity measurements. From the spectral studies, a square pyramidal structure proposed for Co(II) and Ni(II) complexes, while octahedral geometry for Cr(III), Cu(II) and Cd(II) complexs. A theoretical treatment of these compounds in gas phase was studied using Hyper Chem.8 program, Semi-empirical method was carried out to evaluate heat of formation ΔH˚f, binding energy ΔEb and dipole moment (μ) for all the complexes, also the vibration frequencies and electronic transitions were calculated for two ligands. Electrostatic potantial, HOMO and LUMO energies for ligands were calculated to determine the reactive sites for these ligands