Abstract
Supramolecular coordination of dioxouranium(VI) heterochelates 5-sulphono-7-(4′- X phenylazo)-8-hydroxyquinoline HL n ( n = 1, X = CH 3; n = 2, X = H; n = 3, X = Cl; n = 4, X = NO 2) have been prepared and characterized with various physico-chemical techniques. The infrared spectral studies showed a monobasic bidentate behavior with the oxygen and azonitrogen donor system. The temperature dependence of the D.C. electrical conductivity of HL n ligands and their uranyl complexes has been studied in the temperature range 305–415 K. The thermal activation energies E a for HL n compounds were found to be in the range 0.44–0.9 eV depending on the nature of the substituent X. The complexation process decreased E a values to the range 0.043–045 eV. The electrical conduction mechanism has been investigated for all samples under investigation. It was found to obey the variable range hopping mechanism (VRH).
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