TRANSPORT AND MAGNETIC-PROPERTIES OF SHEET POLY METALLO PHTHALOCYANINES (POLY M PCS) (M=CU,NI)

Measurements of dc electrical conductivity, sigma, thermopower, S and magnetic susceptibility, chi on poly metallo phthalocyanines ([MPcs]eta) (M = Cu, Ni) before heat treatment (I[MPc]eta) and after heat treatment (II[MPc]eta) are reported sigma at room temperature (RT) for I[MPc]eta is of the order of 10(-9) (ohm. cm)-1. Sigma at RT for II[CuPc]eta is 0.4 (ohm. cm)-1 and drops by three orders of magnitude as the temperature is decreased to 50K while for II[NiPc]eta, sigma-drops from 10(-4) (ohm. cm)-1 at RT to 5*10(-6) (ohm. cm)-1 at 200K. S at 240K is 11-mu-V/K for II[CuPc]eta and 105-mu-V/K for II[NiPc]eta. Both the polymers have a positive thermopower in the temperature range of our measurements. The temperature dependence of sigma is in accordance with that expected for variable range hopping of carriers in 3-dimensions (VRH 3D) for II[CuPc]eta and that expected for VRH of carriers in 2-dimensions (VRH 2D) for II[NiPc]eta. S varies linearly with temperature for II[NiPc]eta. For II[CuPc]eta a sub-linear temperature dependence of S is observed. Chi at 300K for I[NiPc]eta is diamagnetic and for II[NiPc]eta is paramagnetic. Chi at 300K for both I and II[CuPc]eta are paramagnetic. Chi for both the II[MPc]eta are temperature independent from 350K down to 120K and show a Curie like behaviour at lower temperatures.