Discotic Liquid Crystals of Organic Metal Complexes (54): The Conductive Properties of the Crystalline Solid and Liquid Crystalline Mesophases of Bis(octakisdodecyloxy-phthalocyaninato)Iutetium(III)

Abstract

The conductive properties of bis(octakis-dodecyloxy-phthalocyaninato)lutetium(III), [(C₁₂O)₈Pc]₂Lu, have been studied using the pulse-radiolysis time-resolved microwave conductivity technique (PR-TRMC). On heating a freshly precipitated crystalline solid sample sharp increases in conductivity are observed at 61℃ and 90℃. The increases in conductivity found on entering a higher temperature phase are completely opposite to the behaviour shown by all other octaalkoxy substituted phthalocyanines. From the accompanying increase in lifetime of the conductivity transient at the 90℃ transition we suggest that this involves a change from a tilted to a horizontal columnar stacking of the macrocycles. Comparison of the PR-TRMC results with DSC measurements and pcessible explanations for the anomalous behaviour of the lutetium derivative are discussed.