Unusual Folded Structures for a Tethered Squaraine-Cholesterol Derivative in Langmuir−Blodgett Films

A squaraine−cholesterol diad, 1, which has been found to be a good gelator, has been studied in films at the air−water interface and in supported Langmuir−Blodgett films. Both experimental observations and simulations are consistent with a low-energy folded structure in which there are attractive no...

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Bibliographic Details
Published in:Langmuir 2000-01, Vol.16 (1), p.275-281
Main Authors: Stanescu, Marina, Samha, Hussein, Perlstein, Jerry, Whitten, David G
Format: Article
Language:English
Subjects:
Air
CHOLESTEROL
Chromophores
Dyes
GELATION
Gels
MATERIALS SCIENCE
MORPHOLOGY
Phase interfaces
PHOTOCONDUCTIVITY
SQUARYLIUM DYES
Water
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Summary:A squaraine−cholesterol diad, 1, which has been found to be a good gelator, has been studied in films at the air−water interface and in supported Langmuir−Blodgett films. Both experimental observations and simulations are consistent with a low-energy folded structure in which there are attractive noncovalent interactions between the squaraine chromophore and the steroid. Although different structures seem likely for 1 in both the crystal and organogels, the present studies suggest that the folded structure exists in both uncompressed and compressed films at the air−water interface and in supported LB films. In both environments the squaraine chromophore shows evidence of squaraine−squaraine aggregation; both “J” and “H” aggregates are indicated depending upon the conditions imposed upon the film.
ISSN:0743-7463
1520-5827
DOI:10.1021/la990755n