Synthesis, characterization and mesomorphic properties of new liquid-crystalline compounds involving ester–chalcone linkages.

Autor:	Thaker, B. T., Patel, D. M., Tandel, P. K., Jesani, M. S., Vyas, C. J., Vansadia, A. D.
Předmět:	LIQUID crystals LIGHT sources ESTERS ORGANIC compounds SPECTRUM analysis
Zdroj:	Phase Transitions; Jun2005, Vol. 78 Issue 6, p521-527, 7p, 1 Color Photograph, 2 Diagrams, 4 Charts, 2 Graphs
Abstrakt:	We report the synthesis and evaluation of thermal behaviour of two novel series of chalcone-based liquid-crystalline compounds. The flexibility in these systems is provided by attaching straight alkoxy chain at one end. All the mesogens have been characterized by spectroscopic methods such as 1 H-NMR, FTIR, mass spectra, UV/Vis, and also elemental analysis. Their thermal behaviour was evaluated mainly by polarizing optical microscopic observation and DSC studies. It has been observed that the majority of the compounds display nematic and/or smectic mesophases. In both the series, compounds having C3 to C7 tail display only enantiotropic nematic phase, whereas C8 and C10 homologues exhibit enantiotropic smectic C and nematic phases. The higher homologues with C12, C14 and C16 tails show the smectic C phase only. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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