Gamma-irradiation effects on the electrical conductivity behaviour of some N,N'-ethylenebis (salicylideneiminato) divalent metal chelates

Abstract

γ-Irradiation effects on the electrical conductivity behaviour of some newly prepared mono-, homobi- and heterobinuclear metal chelates containing divalent Co, Ni, Cu, Cd and Hg cations of N,N'-ethylenebis (salicylideneimine) H 2SED were investigated. The complexes were identified on the basis of elemental analysis, electronic and infrared spectra. X-Ray diffraction patterns showed that all complexes are well crystalline substances. The variation of the electrical conductivity with temperature was found to be characteristic of an intrinsic semiconductor with impurity centres. The rate constants of the isothermal annealing and the activation energies of the electrical conduction of the irradiated and unirradiated metal chelates were calculated and discussed. It was found that electrical conductivity increases on increasing temperature and decreasing irradiation dose. However, the rate constant of thermal annealing increases in the order mono-, homobi- and heterobinuclear chelates. Seeback effect studies showed that electrons are the majority charge carriers in all irradiated and unirradiated complexes.