TEMPERATURE-DEPENDENCE OF THE ELECTRICAL-CONDUCTIVITY OF 4-(2-OH-4-CH3 PHENYL AZO)-ANTIPYRINE AND ITS COPPER SOLID COMPLEX

Correlation of the molecular structure with the current-voltage and te mperature dependence of the electrical conductivity of 4-(2-OH-4-CH3 p henyl azo)-antipyrine and its copper solid complex was carried out. Th e values of the thermal activation energies and the energy gaps repres enting the maximum absorption bands of ultraviolet (UV) and visible sp ectra in the solid state indicate the semiconducting behaviour of the two compounds. The semiconducting properties of the ligand arise as a result of electron-delocalization via double bonds conjugation (N=N, C =C), tautomerization and hydrogen bond formation and altered by the co pper ion in copper complex. (C) 1998 Elsevier Science B.V.