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Título

Photoinduced supramolecular chirality in side-chain liquid crystalline azopolymers

AutorTejedor, Rosa M.; Millaruelo, Marta; Oriol, Luis; Serrano, José Luis; Alcalá, Rafael; Rodríguez, Francisco J.; Villacampa, Belén
Fecha de publicaciónmar-2006
EditorRoyal Society of Chemistry (Great Britain)
CitaciónJournal of Materials Chemistry 16(17): 1674-1680 (2006)
ResumenA series of liquid crystalline homopolymers that have photoisomerizable cyanoazobenzene groups in the side chain has been synthesized and characterized. Thin films of these polymers have been processed in order to study the absorption spectra and circular dichroism responses after illumination with 488 nm circularly polarized light. The tendency of the azobenzene units to aggregate and the modification of the electronic spectra by illumination were studied by UV-vis spectroscopy. Illumination with circularly polarized light of the azopolymers gave rise to a photoinduced circular dichroism response, which suggests supramolecular structures with a chiral orientation of the azobenzene chromophores in H-aggregates. The photoinduced supramolecular order depends on the polymer structure, i.e., on the Tg and the length of the flexible spacer, and the nature of the liquid crystal phase. Identical absorption spectra and reverse circular dichroism spectra were obtained after irradiation with circularly polarized light of opposite handedness and this is due to the photoinduction of enantiomeric supramolecular structures. The thermal stability above Tg of the photoinduced supramolecular chirality is determined by the polymer structure.
Descripción7 pages, 6 figures, 3 tables.
Versión del editorhttp://dx.doi.org/10.1039/b518269g
URIhttp://hdl.handle.net/10261/19458
DOI10.1039/b518269g
ISSN0959-9428
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