Synthesis, structural and spectral studies of 5-methyl 2-furaldehyde thiosemicarbazone and its Co, Ni, Cu and Cd complexes

The reaction of cobalt, nickel, copper and cadmium chlorides and bromides w ith 5-methylfurfural thiosemicarbazone (M5FTSC) leads to the formation of t wo series of new complexes: [M(M5FTSC)(2)X-2], [M(M5FTSC)X-2]. They have be en characterized by spectroscopic studies (infrared, H-1 NMR, and electroni c spectral. The crystal structures of the free ligand M5FTSC and of the com pound [CuCl2(M5FTSC)] have been determined by X-ray diffraction methods. Fo r the Co(II), Ni(II) and Cu(II) complexes, the central atom is coordinated through the sulphur atom and the azomethine nitrogen atom whilst for the Cd (II) complexes, the coordination atoms are the sulphur and furanic oxygen a toms instead of the azomethine nitrogen. (C) 2001 Elsevier Science B.V. All rights reserved.