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Molecular Factors Responsible for the Formation of the Axially Polar Columnar Mesophase Col h P A
Author(s) -
Matraszek Joanna,
Mieczkowski Jozef,
Pociecha Damian,
Gorecka Ewa,
Donnio Bertrand,
Guillon Daniel
Publication year - 2007
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.200601192
Subject(s) - mesophase , axial symmetry , polar , mesogen , materials science , phase (matter) , bent molecular geometry , crystallography , molecule , core (optical fiber) , polarity (international relations) , phase transition , chemical physics , chemistry , liquid crystalline , composite material , organic chemistry , thermodynamics , geometry , physics , biochemistry , mathematics , astronomy , cell
The structure of hexacatenar bent‐shape molecules has been systematically modified in order to determine the main molecular factors responsible for the appearance of the axially polar columnar mesophase. It was found that the stability of the polar phase is very sensitive to the subtle modifications of the molecular shape: the phase is solely preserved if the modification is made at the terminal parts of the mesogenic core, whilst any other modifications destabilize the phase. It can be concluded that the main factor driving the transition between the phase made of flat supramolecular discs and the axially polar phase made of the cone‐like units is the ability to fulfill close packing conditions in order to eliminate voids between neighboring molecular rigid cores.