Complexes of N-picolinoyl-N′-2-furanthiocarbohydrazide with oxovanadium(IV), manganese(III), iron(III), cobalt(II), nickel(II), copper(II), zinc(II), and cadmium(II)

The complexes [M(L)(H2O)(x)](n) [M = Co(II), Ni(II), Cu(II), Zn(II), Cd(II)] and [M-2(L)(3)], [M = Mn(III), Fe(III)] and [VO(HL)(2)] with N-picolinoyl-N'-2-furanthiocarbohydrazide (H2L) have been prepared and characterized by elemental analyses, magnetic susceptibility measurement, electronic, NMR (H-1 and C-13), IR and FAB mass spectral data. Physico-chemical studies indicate that the complexes are polymeric in nature. The room temperature ESR spectra of [VO(HL)(2)] and [Cu(L)](n) complexes yield <g> values, characteristic of square-pyramidal and square-planar complexes, respectively. The Mossbauer spectra of [Fe-2(L)(3)](n) at room temperature and at 78 K suggest the presence of high-spin (S = 5/2) and low-spin (S = 1/2) forms of Fe(III) in the same complex at both temperatures. The complexes of OV(IV), Fe(III), Ni(II), and Cd(II) show semiconducting behaviour in the solid state in the temperature range 307-397K, with a band gap of 0.18-0.44eV. The other complexes are insulators.