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Langmuir, Vol.16, No.1, 275-281, 2000
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 inter face 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.
Keywords:MOLECULAR SELF-ASSEMBLIES;SQUARYLIUM DYE;AGGREGATION;ORIENTATION;ABSORPTION;SPECTRA;LAYERS;GELS