Shape dependence in the formation of condensed phases exhibited by disubstituted sucrose esters
SourceChemistry : a European Journal, 13, 6, (2007), pp. 1763-1775
Article / Letter to editor
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Spectroscopy of Solids and Interfaces
Chemistry : a European Journal
SubjectMolecular Materials; Spectroscopy of Solids and Interfaces
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.
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