Discotic liquid crystals of transition metal complexes: 28. Temperature-dependent electronic spectra and X-ray structural analysis of discotic liquidcrystalline bis(octakisdodecyloxyphthalocyaninato)lutetium(III) complex

An unidentified mesophase D-x of bis(octakisdodecyloxyphthalocyaninato)lute tium(III) reported by us in 1997 was reinvestigated by temperature-dependen t X-ray diffraction and temperature-dependent electronic spectra of the thi n film. The D-x phase was thus established as a novel type of D-ro (P2(1)/a ) mesophase in which two different stacking distances h(t) and h(f) exist. It was also revealed that the step-up increase of electroconductivity is at tributable to the step-up enlargement of pi-pi overlap of Pc macrocycles ac cording to the phase transitions crystal --> D-ro (P2(1)/a) --> D-bo. This is strongly related to delocalization of the radical electron. Copyright (C ) 2001 John Wiley & Sons, Ltd.