Abstract
A new hydrazone ligand [2-(4-methoxyphenylamino)-N'-(thiophen-2-yl-methylene)acetohydrazide], was prepared and characterized. The ligand reacted with Cu(II), Ni(II), Co(II), Mn(II), Zn(II), Hf(IV), Ru(III) and ZrO(II) ions to yield mononuclear complexes The obtained metal complexes have been characterized using elemental and thermal analyses (TG and DTA), IR, UV-Vis and ESR as well as magnetic moment and molar conductance measurements. The results showed that the hydrazone behaves as a neutral bidentate ligand which coordinates with the metal ions via the thiophene sulphur atom and imido N-H as in case of complexes of the general formula: [M(HL)(2)X-2] nH(2)O, where M = Cu(II), X = OAc, n = 2; M = Co(II), X Cl and Br, n = 0, 1, respectively, M = Ni(II), X = OAc, n = 1; M = Mn(II), X = OAc, n 1; M = Zn(II), X = OAc, n = 0; M ZrO(11), X = Cl, n = 5; [M(HL)(2)(NO3)]center dot NO3 center dot nH(2)O, where M =Co(II), n = 1, M = Zn(II), n= 0; [M(HL)X-2]center dot nH(2)O, where M=Cu(II), X=Cl, n= 1; M =Co(II), X =OAc, n = 1 and [Ru(HL)(2)Cl-2]CL The ligand also coordinates via the carbonyl oxygen atom and azomethine nitrogen atom as in case of [Cu(HL)(NO3)]NO3 center dot 1.5H(2)O complex and via the. carbonyl oxygen atom and the aniline N-H as in case of complexes [Ni(HL)Cl-2] H2O and [Ni(HL)(2)(NO3)] NO3 center dot 4H(2)O As a tridentate monobasic ligand HL coordinates through the thiophene sulphur atom, azomethine nitrogen atom and the enolic oxygen atom as in case of complex [Hf(L)Cl-3]center dot 3H(2)O. The geometrical shapes of complexes also have been elucidated. The thermal behavior of some metal complexes has also been studied using TG and DTA.