Abstract
We have used the pulse-radiolysis time-resolved microwave conductivity technique (PR-TRMC) to study the charge transport properties of the free-radical sandwich complex bis(octakis(dodecyloxy)phthalocyaninato)lutetium(III), [(C12O)8Pc]2Lu. This compound displays multimesomorphic thermotropic behavior with two columnar liquid crystalline phases, Dx and Dh, between the freshly precipitated crystalline solid at room temperature, Kv, and the isotropic liquid, I, at 196 °C. In contrast with all other discotic materials previously studied using the PR-TRMC technique, the mobility of charge carriers is found to increase markedly at the transition from the Kv phase to the first columnar mesophase, Dx. The mobility displays a further substantial increase on entering the higher temperature hexagonal columnar phase, Dh. The intracolumnar mobility determined just above the Dx → Dh transition temperature of 90 °C is 0.17 × 10-4 m2/(V s), which is the highest yet determined for a columnar liquid crystalline material. T...
Published Version
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