Document Detail

Induction of columnar and smectic phases for spiropyran derivatives: effects of acidichromism and photochromism.
MedLine Citation:
PMID:  18283696     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Liquid-crystalline (LC) properties have been induced in a number of spiropyran derivatives by the addition of methanesulfonic acid. Spiropyran derivatives containing one or two gallic acid moieties with one, two, or three long alkyl chains were prepared. Acid-induced spiro-protonated-merocyanine isomerization induced mesomorphism for these materials. Equimolar mixtures of methanesulfonic acid and the spiropyran derivatives with one or two dodecyloxy chains exhibited smectic A phases, whereas the spiropyran derivatives containing the gallic acid moiety with three dodecyloxy chains showed hexagonal columnar phases. On the contrary, photoirradiation of the spiropyran compounds in the bulk liquid state did not lead to the induction of mesomorphism, although the merocyanine form was induced. These results suggest that these merocyanine derivatives with ionic and nonionic moieties cannot simply form nanosegregated LC structures. Complex formation of the merocyanine form with methanesulfonic acid may play a key role in the formation of LC molecular assemblies.
Boon-Hooi Tan; Masafumi Yoshio; Takashi Kato
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Chemistry, an Asian journal     Volume:  3     ISSN:  1861-471X     ISO Abbreviation:  -     Publication Date:  2008 Mar 
Date Detail:
Created Date:  2008-03-10     Completed Date:  2008-08-15     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101294643     Medline TA:  Chem Asian J     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  534-41     Citation Subset:  -    
Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
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