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New Triphenylene Based Discotic Liquid Crystals with Mixed Tails: Molecular Symmetry and Wide Columnar Mesophase Range
Author(s) -
Zhao KeQing,
Wang BiQin,
Hu Ping,
Gao CaiYan,
Yuan FuJin,
Li HuiRong
Publication year - 2006
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200690040
Subject(s) - mesophase , triphenylene , discotic liquid crystal , differential scanning calorimetry , chemistry , columnar phase , crystallography , liquid crystal , optical microscope , scanning electron microscope , molecule , optics , organic chemistry , materials science , phase (matter) , thermodynamics , composite material , physics
A series of new trialkoxytrialkanoyloxytriphenylene TP(OC n H 2 n +1 ) 3 (OCOC m H 2 m +1 ) 3 ( 5a – 5e ) ( n = m +1=4–8) discotic liquid crystals were prepared and their mesomorphic properties were investigated using differential scanning calorimetry (DSC) and polarizing optical microscopy (POM). The symmetrical and shorter chain triphenylenes display higher melting points and clearing points, more highly ordered and stable columnar mesophase than the asymmetrical and longer chain triphenylenes respectively.