Photoalignment Layers for Liquid Crystals from the Di-π-methane Rearrangement
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648.65 KB
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Author(s)
Cox, Jason R.
Simpson, Jeffrey H.
Swager, Timothy Manning
Date Issued
January 2013
Journal
Journal of the American Chemical Society
Publisher
American Chemical Society (ACS)
Citation
Cox, Jason R., Jeffrey H. Simpson, and Timothy M. Swager. “Photoalignment Layers for Liquid Crystals from the Di-π-methane Rearrangement.” Journal of the American Chemical Society 135, no. 2 (January 16, 2013): 640-643.
Version
Author's final manuscript
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.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
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DOI of Published Version
https://doi.org/10.1021/ja312090p
