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Shape Dependence in the Formation of Condensed Phases Exhibited by Disubstituted Sucrose Esters
Author(s) -
Molinier Valérie,
Kouwer Paul J. J.,
Fitremann Juliette,
Bouchu Alain,
Mackenzie Grahame,
Queneau Yves,
Goodby John W.
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.200600368
Subject(s) - thermotropic crystal , lamellar structure , chemistry , saturation (graph theory) , crystallography , sucrose , phase (matter) , liquid crystal , phase transition , stereochemistry , materials science , organic chemistry , liquid crystalline , thermodynamics , physics , mathematics , optoelectronics , combinatorics
We report on the self‐organizing properties of sucrose esters that are di‐(1′,6′, 1′,6, and 6,6′)‐substituted with aliphatic chains of identical or different chain lengths and levels of saturation. For the materials possessing two saturated aliphatic chains, the compounds exhibited thermotropic lamellar smectic A phases. A remarkable new phase transition was observed for the di‐octadecanoyl homologue in which one smectic A phase transformed into another with a continuous change in layer spacing, but with a discontinuous change in the correlation length. The incorporation of long cis ‐unsaturated chains led to increased cross‐sectional areas of the chains relative to the sucrose head groups and, hence, columnar phases were observed.