NDLI: Synthesis and liquid-crystalline properties of novel laterally connected twins: the influence of the connecting topology and the length of the rigid core

Content Provider	Royal Society of Chemistry (RSC)
Author	Andersen, Jens Diele, Siegmar Tschierske, Carsten Lose, Dirk
Copyright Year	1996
Abstract	Laterally ligated p-terphenyl twins containing 2-oxapropylene spacers have been synthesized. Their liquid-crystalline properties were investigated by polarizing microscopy, calorirnetry and X-ray scattering. The mesophase stability depends strongly on the topology of connection. It was found that the connection of the mesogenic units at the peripheries of the rigid cores gave twins with the highest clearing temperatures and the broadest smectic C (SC) ranges. Shifting the connecting units to the middle of the rigid cores diminished their mesophase stability. The X-ray investigations indicated that the thickness of the smectic layer was nearly independent of the position of the lateral connecting group when the same mesogens were linked. Also, twins incorporating a 1,4-disubstituted phenyl ring and a biphenyl rigid core have been prepared and they were found to exhibit broad mesomorphic ranges. Another kind of twins was obtained by the lateral–terminal connection of a p-terphenyl rigid core and a 2,5-diphenyl-l,3,4-thiadiazole calamitic unit. Again, a remarkable influence of the connecting position was observed.
Starting Page	1297
Ending Page	1307
Page Count	11
File Format	PDF
ISSN	09599428
Volume Number	6
Issue Number	8
Journal	Journal of Materials Chemistry
DOI	10.1039/JM9960601297
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Terphenyl Microscopy X-ray scattering techniques Mesophase Topology Liquid crystal X-ray crystallography Phenyl group
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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