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A Liquid‐Crystal Study of Heptalene
Author(s) -
Gottarelli Giovanni,
Hansen HansJürgen,
Spada Gian Piero,
Weber Roland H.
Publication year - 1987
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19870700222
Subject(s) - chemistry , liquid crystal , biphenyl , perpendicular , crystallography , orientation (vector space) , stereochemistry , line (geometry) , condensed matter physics , organic chemistry , physics , geometry , mathematics
The chiral structure of heptalene is characterised, for a given configuration, by helicities, which are opposite in the direction ( x ) of the central C(5a)‐C(10a) bond and in the direction ( y ) of a line perpendicular to it, passing through the C(3)‐and C(8)‐atoms. These two helicities can be experimentally established and differentiated by the handedness of the cholesteric mesophases induced in a biphenyl‐type liquid crystal (LC) by chiral heptalenes with substituents favouring the x or y orientation along the nematic director of the LC.