Mesomorphism in chloro substituted isomeric series including chalconyl central bridge

A novel homologous series of thermotropic liquid crystals α-4-(4′-n-alkoxy benzoyloxy phenyl) β-2″-chloro benzoyl ethylenes have been synthesized and studied with a view to understand and establish the effect of molecular structure on liquid crystal (LC) properties with reference to molecular flexib...

Full description

Saved in:
Bibliographic Details
Published in:Molecular Crystals and Liquid Crystals 2017-01, Vol.643 (1), p.233-240
Main Authors: Namera, Dipti L., Ranchchh, Avani R., Bhoya, U. C.
Format: Article
Language:English
Subjects:
Crystals
Enantiotropy
Homology
Liquid crystals
mesomorphism
Molecular chemistry
Molecular structure
Nematic
Phenyls
smectic
Surface layer
Texture
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A novel homologous series of thermotropic liquid crystals α-4-(4′-n-alkoxy benzoyloxy phenyl) β-2″-chloro benzoyl ethylenes have been synthesized and studied with a view to understand and establish the effect of molecular structure on liquid crystal (LC) properties with reference to molecular flexibility in isomeric series with differing positional status of same functional group. Novel homologues series consist of 12 homologues C 1 to C 16. C 1 , C 2 , and C 3 homologues are nonliquid crystals (NLC) and rest of the homologues are liquid crystals. C 10 to C 16 homologues are enantiotropically smectogenic plus nematogenic and C 4 to C 8 homologues are enantiotropic nematic. The texture of nematogenic derivatives is threaded or schlieren and that of the smectic mesophase are focal conic of the type smectic A or C. Analytical, thermal and spectral data supported molecular structures of novel homologues. Transition temperatures as determine by a hot stage polarizing optical microscopy (POM) were plotted against number of carbon atom present in n-alkyl chain 'R' of left n-alkoxy (-OR) group and the phase transition curves Cr-I/M, Sm-N, N-I were obtained on linking like or related points. The odd-even effect is observed for the N-I transition curve and thus transition curves behaved in normal manner. The even-membered nematic transition curve occupied higher position than the odd-membered transition curve. Present series is predominantly nematogenic and partly smectogenic with middle-ordered melting type.
ISSN:1542-1406
1563-5287
1527-1943
DOI:10.1080/15421406.2016.1272801