BIOLOGICAL AND SOLID STATE ELECTRICAL CONDUCTANCE PROPERTIES OF THE COMPLEXES OF 1-SALICYLOYL-4-BENZOYL-3- THIOSEMICARBAZIDE WITH MANGANESE(II), COBALT(II), NICKEL(II), COPPER(II), AND ZINC(II)

摘要

This paper describes the solid state electrical conductivity of a new ligand, 1-salicyloyl-4-benzoyl-3-thiosemicarbazide (HL), and its complexes (M(L)(SCN)) (M = Mn(II), Co(II), Cu(II) or Zn(II)), (Ni(L)(SCN)(H_2O)) and (M(L)Cl) (M = Mn(II), Co(II), Ni(II), Cu(II) or Zn(II)). The structure and bonding of the complexes have been investigated on the basis of elemental analyses, magnetic susceptibility, UV-Vis., IR, ESR, FAB-mass and NMR spectral data. The above studies indicate that the cobalt(II), nickel(II) and manganese(II) complexes have a tetrahedral structure, while the copper(II) complex is square-planar. Solution conductivity measurements reveal non-electroldtic behaviour of the complexes. Temperature dependent compressed pellets of the complexes in the temperature range 303-383K exhibited sigma_(rt) values in the 10~(-11) - 10~(-7) S cm~(-1) range. All of the complexes are semiconductors as their conductivity increases with temperature increase, showing a band gap of 0.20-0.65 eV.