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New 2,2′‐Substituted 4,4′‐Dimethoxy‐6,6′‐dimethyl[1,1′‐biphenyls], Inducing a Strong Helical Twisting Power in Liquid Crystals
Author(s) -
Holzwarth Richard,
Bartsch Richard,
Cherkaoui Zoubair,
Solladié Guy
Publication year - 2004
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200400035
Subject(s) - dopant , liquid crystal , biphenyl , mesogen , materials science , residue (chemistry) , optically active , liquid crystalline , molecule , crystallography , stereochemistry , organic chemistry , doping , chemistry , optoelectronics
Based on the stabilisation of the molecular motion by the chiral residue, novel optically active biphenylic chiral dopants for nematic liquid crystals were developed. This molecular congestion was obtained by introducing mesogenic residues on the 2,2′‐positions of the chiral biphenyl; this led to a novel molecular architecture that was found to be efficient. The synthesised optically active biphenyls were characterised with very short cholesteric pitches when used as chiral dopants in nematic liquid crystals. The synthesis of the enatiomerically pure biphenyl dopants and their preliminary physicochemical characterisations are described.