Complexes with chemical compositions VO(Hatth)2SO4, VO(Hatth)2SO4'py, [M(Hatth)2Cl'H20]Cl [M = Mn(II), Co(II) and Ni(II)], [Cu(Hatth)2CI]zClz, [Cu(Hatth)2. Cl'py] CI, [Cd(Hatth) 2 Cl] C1, M(Hatth)2Cl2 [M --Zn(II) and Hg(II)], VO(atth h, VO(atthhpy, M(atth)z(py h [M = Mn(II) and Cu(lI)], M(atthh(H20)2 [M = Mn(II), Co(II), Ni(II), Cu(II) and Zn(II)], Hatth = 2-acetylthiophene-2-thenoylhydrazone, and atth, its deprotonated form, have been prepared and characterized by analytical data, molar conductance, magnetic susceptibility, electronic and photoacoustic, ESR, IR and NMR spectral studies. X-ray diffraction study has been used to determine the shape and the dimensions of the unit lattice of r complexes.