The synthesis and characterization of low molecular mass compounds containing 1,4-bis-(5-phenyl-1,3,4-oxadiazolyl)benzene is reported. All compounds are uorescent in solution. Due to the at shape of the conjugated unit, smectic-like packing is observed at high temperatures for some of the synthesized compounds. Moreover the insertion of a lateral exible alkoxy unit strongly destabilizes the smectic order whilst promoting the appearance of a nematic phase in the case of the shortest methoxy unit. The mesogenic character of this unit may be of interest in the synthesis of liquid crystalline polymeric systems, taking advantage of both the uorescent properties and the peculiar molecular structure of the liquid crystalline state.
Synthesis and liquid crystalline properties of low molecular mass compounds containing the 1,4-bis(5-phenyl-1,3,4-oxadiazolyl)benzene unit.
CONCILIO, Simona;IANNELLI, Pio;PIOTTO PIOTTO, Stefano;SCARFATO, Paola
2002
Abstract
The synthesis and characterization of low molecular mass compounds containing 1,4-bis-(5-phenyl-1,3,4-oxadiazolyl)benzene is reported. All compounds are uorescent in solution. Due to the at shape of the conjugated unit, smectic-like packing is observed at high temperatures for some of the synthesized compounds. Moreover the insertion of a lateral exible alkoxy unit strongly destabilizes the smectic order whilst promoting the appearance of a nematic phase in the case of the shortest methoxy unit. The mesogenic character of this unit may be of interest in the synthesis of liquid crystalline polymeric systems, taking advantage of both the uorescent properties and the peculiar molecular structure of the liquid crystalline state.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
