Ba. El-sayed et Mm. Sallam, Temperature and frequency dependent electrical transport in thiourea and tris (thiourea) copper (I) sulphate, J MAT S-M E, 10(1), 1999, pp. 63-66
The d.c. conductivity of thiourea and tris (thiourea) copper sulphate have
been measured as a function of temperature, including their phase transitio
n temperatures. The thermal activation energy values obtained showed that t
he two compounds behaved as semiconducting materials. The mechanism of the
conductivity was interpreted in the light of their molecular spectroscopic
data in the infrared, ultraviolet and visible regions. The semiconducting p
roperties of the ligand (TU) arise as a result of electron-delocalization v
ia pi-bond formation (C=NH, C=NH2+), the hydrogen transfer and the highly p
olar resonance hybride structural formation, and are altered by the copper
ion in copper (TU) complex. The a.c. conductivity was measured at room temp
erature. (C) 1999 Kluwer Academic Publishers.