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J Am Chem Soc. 2013 Jan 16;135(2):640-3. doi: 10.1021/ja312090p. Epub 2013 Jan 2.

Photoalignment layers for liquid crystals from the di-π-methane rearrangement.

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1
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Abstract

Photoalignment of nematic liquid crystals is demonstrated using a di-π-methane rearrangement of a designed polymer. The alignment mechanism makes use of the strong coupling of the liquid crystal directors to dibenzobarrelene groups. The large structural changes that accompany photoisomerization effectively passivate segments of the polymer, allowing the remaining dibenzobarrelene groups to dominate the director alignment. Photoisomerization requires triplet sensitization, and the polymer was designed to have a uniaxially fixed rigid structure and rapid triplet energy transfer from the proximate benzophenone units to the dibenzobarrelene groups. The isomerization was observed to be regiospecific, and thin films showed alignment.

PMID:
23281808
DOI:
10.1021/ja312090p
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