SYNTHESIS, CHARACTERIZATION AND ELECTRICAL-CONDUCTIVITY PROPERTIES OFHOMO-DI AND HETERO-DI AND TRIMETALLIC COMPLEXES OF MIXED AZO DYES

The synthesis of seven new complexes of mixed ligands and metals are r eported. Their stoichiometries (metals:ligands) were found to be 1:3, 2:2 and 3:2 corresponding to FeL12L2H, M2L1L2 and M'M2L1L2, respective ly (where M' = Cu2+, M = Cu2+, Co2+ or Ni2+; HL1 = Methyl Red; H2L2 = Alizarin Yellow R). The complexes were characterized by elemental anal ysis, infrared and Nujol mull electronic spectra and magnetic moment m easurements. The results of the electrical conductivity studies for th e prepared complexes in the solid state (using compressed tablets) ind icated reasonable semiconducting properties. The magnitude of these va lues, log sigma291 lay between -5.46 and -8.67, resulting from the str ucture and nature of the substituent of the two mixed ligands as well as the high metallic content of their complexes.