Synthesis and transport properties of rigid poly(octasubstituted phthalocyaninatosiloxanes)

Coaxially polymerized, peripherally substituted derivatives of phthalocyanine (‐[SiPc(CnH2n+ 1)8‐O‐]; n = 8, 12) have been synthesized and characterized. They display efficient energy‐migration properties and a dark conductivity at room temperature of 2 × 10−2 S · m−1, even in the absence of dopants. The temperature dependence of the conductivity for the C8 derivative, over the range ‐ 50 to + 200°C, is given, to a good approximation, by σ = 1.5 · exp [‐ Ea/(kB · T)] S · m−1 with an activation energy Ea of 0.11 eV (2.5 kcal/mole). This material could be an example of an intrinsic, one‐dimensional conducting polymer.