Abstract
The synthesis and detailed structural characterization of phthalocyanine derivatives substituted by six dodecyloxy side chains and a single poly(oxyethylene) moiety are described. All of the materials possess columnar mesogenic properties. The phthalocyanines attached to short poly(oxyethylene)s possess an ordered hexagonal mesophase (Dho) of structure similar to that obtained from octakis(dodecyloxy)phthalocyanine. However, the Pc attached to a long poly(oxyethylene) side chain displays a less ordered columnar mesophase, probably columnar nematic (Nc), due to steric disturbance of the two-dimensional hexagonal lattice by the polymeric substituent. This material also displays an interesting phase separation of the poly(oxyethylene) and alkoxy side chains in the solid state.
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