la990755n_si_001.pdf (76.98 kB)
Unusual Folded Structures for a Tethered Squaraine-Cholesterol Derivative in Langmuir−Blodgett Films†
journal contribution
posted on 1999-11-03, 00:00 authored by Marina Stanescu, Hussein Samha, Jerry Perlstein, David G. WhittenA 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.