Synthesis, Spectral Characterization, Cyclic Voltammetry, Molecular Modeling and Catalytic Activity of Sulfa-Drug Divalent Metal Complexes

Abstract

Complexes of cobalt(II), nickel(II), copper(II), zinc(II) and Hafnium(II) of general composition [M(L)2(Cl)2] [L = 4-(phenylphosphinylideneamino-N-thiazolyl benzene-sulfonamide] have been synthesized. The elemental analysis, molar conductance measurements, magnetic susceptibility measurements, mass, IR, UV, NMR, SEM, EDX, thermal and EPR spectral studies of the compounds led to the conclusion that the ligand acts as a bidentate manner. The molar conductance of the complexes in fresh solution of DMSO lies in the range of 7.46-9.13 Ω -1 cm 2 mol -1 indicating their non-electrolytic behavior. On the basis of analytical and spectroscopic techniques, octahedral geometry of the complexes was proposed. The ligand binds in a bidentate manner, coordinated through sulfonamide oxygen and thiazole nitrogen atoms. The ligand field parameters were calculated for Co(II), Ni(II) and Cu(II) complexes and their values were found in the range reported for a octahedral structure. The catalytic activities of the divalent metal complexes have been studied in the oxidation of cyclohexane by hydrogen peroxide, an environmental friendly oxidant. The molecular modeling parameters of the ligand and its Co(II) and Hf(II) complexes have been calculated.

Cyclic Voltammetry and Its Applications

“…Redox potential and reversibility obtained by CV have been proved to be useful in studying metalloenzymes with cofactor of molybdenum complexes as a model to describe its physiological role [21]. The characterizations of metal complexes have also been indicated to help investigate the catalytic activities Cyclic Voltammetry and Its Applications DOI: http://dx.doi.org/10.5772/intechopen.83451 of complexes for the removal of toxic phenolic substances, especially dyes [22]. At quantum level, redox potentials from CV can be used in calculating LUMO and HOMO as well as the gaps of new organic semiconductors, which are applicable in everyday life [23].…”