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The Influence of the Shape and the Incompatibility of Molecular Moieties on the Structure of Smectic Mesophases
Author(s) -
Pelzl G.,
Diele S.,
Lose D.,
Ostrovski B. I.,
Weissflog W.
Publication year - 1997
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170320110
Subject(s) - antiparallel (mathematics) , fluorocarbon , steric effects , molecule , crystallography , hydrocarbon , chemistry , side chain , stereochemistry , materials science , organic chemistry , polymer , physics , quantum mechanics , magnetic field
For selected compounds with perfluorinated chains the structure of smectic phases was investigated by X‐ray diffraction measurements. For rod‐like compounds with only one terminal perfluorinated chain the incompatibility of the hydrocarbon and the fluorocarbon moieties leads to a segregation of both parts which can be considered as microphase separation. For swallow‐tailed compounds the structure of smectic phases depends on the position and the length of the perfluorinated chains. If the steric interaction dominates an antiparallel packing of the molecules within the smectic layers is favoured. If the incompatibility of the hydrocarbon and fluorocarbon moieties is of importance the smectic layers are distorted and at lower temperatures the layer structure is transformed into a columnar structure.