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Lyotropic Chiral Nematic Liquid Crystalline Aliphatic Conjugated Polymers Based on Di-Substituted Polyacetylene Derivatives that Exhibit High Dissymmetry Factors in Circularly Polarized Luminescence.
MedLine Citation:
PMID:  23150937     Owner:  NLM     Status:  Publisher    
We synthesized di-substituted liquid crystalline polyacetylene (di-LCPA) derivatives bearing 4-nonyloxy phenyl groups with lyotropic and thermotropic LC behavior. The poly(diphenylacetylene) (PDPA) main chain structure of the di-LCPAs and the chirality induced with either chiral moieties or chiral dopants allow the formation of a highly ordered lyotropic N*-LC phase. Circular dichroism (CD) spectra of the di-LCPAs imply that one-handed intrachain helical structures are formed in solution, while interchain helical π-stacking between the polymer main chains are formed in cast film and in the N*-LC state. Absorption dissymmetry factors (gabs) in the N*-LC state show values on the order of 10-1. The N*-LC state facilitates the formation of helically π-stacked structures with a high degree of helical ordering of the di-LCPA and is indispensable for the generation of circularly polarized luminescence (CPL) with high emission dissymmetry factors (gem) on the order of 10-1. To the best of our knowledge, this is the highest reported value of CPL achieved for aliphatic, conjugated polymers. As an alternative to the thermotropic N*-LC phase, we have found that the lyotropic N*-LC phase of di-LCPA could be promising materials possessing CPL functionality for use in next-generation π-conjugated organic optoelectronic devices, displays, and sensors.
Benedict Arcena San Jose; Satoshi Matsushita; Kazuo Akagi
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-14
Journal Detail:
Title:  Journal of the American Chemical Society     Volume:  -     ISSN:  1520-5126     ISO Abbreviation:  J. Am. Chem. Soc.     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-15     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503056     Medline TA:  J Am Chem Soc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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