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Issue 17, 2006
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Photoinduced supramolecular chirality in side-chain liquid crystalline azopolymers

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Abstract

A 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.

Graphical abstract: Photoinduced supramolecular chirality in side-chain liquid crystalline azopolymers

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Publication details

The article was received on 03 Jan 2006, accepted on 14 Feb 2006 and first published on 01 Mar 2006


Article type: Paper
DOI: 10.1039/B518269G
Citation: J. Mater. Chem., 2006,16, 1674-1680
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    Photoinduced supramolecular chirality in side-chain liquid crystalline azopolymers

    R. M. Tejedor, M. Millaruelo, L. Oriol, J. L. Serrano, R. Alcalá, F. J. Rodríguez and B. Villacampa, J. Mater. Chem., 2006, 16, 1674
    DOI: 10.1039/B518269G

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