Abstract
The complexes of 4-(2,4,6-trichlorophenyl)-3-thiosemicarbazide (HL1), with the transition metal cations VO(II), Co(II), Ni(II), Cu(II), Pd(II), and Pt(II) were prepared and characterized using elemental and thermal analyses; UV-visible spectrophotometry; FTIR; mass, X-ray, and NMR spectroscopies; and molar conductance and magnetic susceptibility measurements. The results showed that the prepared chelates have the following chemical formulae and structures: [(VO)2(L1)(SO4)(C2H5O)×H2O] (square based pyramidal structure), [Co2(HL1)Cl3C2H5OH]×Cl (square planar structure), [Ni(HL1)Cl2]×3H2O (square planar structure), [Cu(L1)2(H2O)2] (octahedral structure), [Pd(HL1)Cl2]×H2O (weakly distorted square planar structure), and [Pt(HL1)Cl2]×1/2H2O (square planar structure). Generally, the complexes exhibited high thermal stability; however, the Pd(II) and Pt(II) complexes were more stable than the other complexes. The ligand (HL1), and its complexes have been screened for their biological activity. Some of the complexes were found more biologically active than the parent ligand.
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