Discotic liquid crystals of transition metal complexes, Part 30: spontaneous uniform homeotropic alignment of octakis(dialkoxyphenoxy)phthalocyaninatocopper(ii) complexes
- 27 November 2000
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry
- Vol. 11 (2) , 423-433
- https://doi.org/10.1039/b004406g
Abstract
Six novel octakis(dialkoxyphenoxy)phthalocyaninatocopper(II) complexes (abbreviated as [(CnO)2PhO]8PcCu (n = 9–14)) have been synthesized. It was found that these derivatives exhibit rich mesophases; Colh, Colr1, Colr2, Colr3, Coltet and Cub phases. These mesophases were characterized by microscopic observation, DSC measurements and temperature-dependent X-ray diffraction measurements. Temperature-dependent electronic spectra for the thin films of these complexes revealed that roof-top-shaped dimers in the column gradually change into cofacial dimers as the temperature is increased from rt to their clearing points. Furthermore, the phthalocyanine derivatives for n = 11–14 exhibited spontaneous uniform homeotropic alignment for the Coltet mesophase, which is the first example in discotic liquid crystalline phthalocyanine compounds.Keywords
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