Prosiding Seminar Kimia Bersama UKM-ITB VIII 9-11 Jun 2009 562 SPECTRAL STUDIES OF ZINC (II) COMPLEX OF 2-ACETYLBENZOTHIOPHENE 3-THIOSEMICARBAZONE

Transition metal complexes of thiosemicarbazones have generated considerable interest due to their wide ranging biological activities. Zinc II complexes with thiosemicarbazone ligands were reported to posses antiproliferative, antitumor and antimicrobial activities. In this work, zinc (II) complex of 2-acetylbenzothiophene 3-thiosemicarbazone [Zn(BTTS)2] has been prepared by condensation of zinc acetate dihydrate with 2-acetylbenzothiophene 3-thiosemicarbazone in ethanol. The complex has been characterized by elemental analysis (C, H, N and S) and spectroscopic methods (infrared, 1 H and 13 C NMR). The spectroscopic results obtained for the zinc (II) complex of 2-acetylbenzothiophene 3-thiosemicarbazone clearly indicated that the ligand in the zinc complex is found to coordinate in the thiole form. Spectroscopic results suggested that the ligand coordinated to the metal centre as a bidentate N, S-donor forming a five-membered chelate ring and the geometry surrounding the zinc centre is close to a tetrahedron.