Ionic liquid crystals bearing bipyridinium and pentaphenylene groups
摘要:
Molecular and polymeric liquid crystals bearing bipyridinium and pentaphenylene groups were synthesized and characterized These new ionic liquid crystals develop single layer smectic-type mesophases with molecules tilted or orthogonal with respect to the smectic planes as a function of temperature A high tendency to develop a homeotropic behavior was observed for the molecular liquid crystals A molecular arrangement was proposed in which the different parts of molecules are fully segregated from one another with the ionic groups stabilizing the smectic order These molecules show a luminescence in the blue region that combined with the liquid-crystalline behavior could be interesting for the fabrication of light emitting thin films with ordered molecular emitters (c) 2010 Elsevier BV All rights reserved