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Spectral and structural studies of transition metal complexes of thiosemicarbazone

Tahani I.Kashar

Mononuclear transition metal complexes with ONS donor phenylhydrazoethylacetoacetate thiosemicarbazone ligand (H2L) were prepared. On the basis of the results fromvarious physico-chemical and spectral studies the ligand behaves as tridentate in all complexes. The solid state ESR spectrumof [Cu(HL)Cl]H2Ocomplex shows an axial type symmetrywith dx2- y2 ground state and an essentially square – planar geometry around the Cu(II) ionwhereas for [Co(HL)Cl]H2Ocharacteristic of tetrahedral geometry. TGAand DTAshowed that the complexes are thermally stable decomposed above 250 C.