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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