Physico-Chemical Study of Co(II), Ni(II) and Cu(II) Complexes of Nitrogen and Sulphur Containing Schiff Base

B. K. Rai¹* and Chandan Kumar²

¹Department of Chemistry, LNT College, Muzaffarpur - 842 002 (India). ²B. R. A. Bihar University, Muzaffarpur, Bihar (India).

A series of complexes of the type [M(DDMS)2X2] where M = Co(II), Ni(II) and Cu(II), X = Cl-, Br-, I- and NO3-; DDMS = 3, 4 dihydro- 5, 6- dimethoxy isocoumarin semicarbazone. Schiff base ligand DDMS obtained by the condensation of 3, 4 dihydro 5, 6 dimethoxy isocoumarine and semicarbazide hydrochloride. The ligand as well as complexes have been characterized by elemental analysis, molar conductance, molar mass, magnetic susceptibility, electronic and IR spectral data. Elemental analyses confirm the stoichiometry of the complexes is 1:2 [Metal:ligand]. Study of IR spectral data proposes DDMS acts as neutral bidentate ligand and coordination takes place through azomethine N and carbonyl oxygen of semicarbazone moiety. The remaining positions of metal ions are satisfied by negative ions, such as Cl-, Br-, I- and NO3-. The molar conductance measurement in DMF indicates the non electrolytic nature of the complexes. The study of electronic spectral data and magnetic susceptibility measurement proposes the geometry of complexes are octahedral in nature.

DDMS/Co(II), Ni(II) and Cu(II)/ Complexes/ Spectral study