Effect of Cis-Backbone on Optical Properties of Polyphenylacetylene

Abstract:

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By controlling the temperature of chemical reaction, we synthesized four polyphenylacetylene samples, in which the percentages of cis configurations were determined to be 65, 75, 85 and 100%, respectively. Ultraviolet-visible and fluorescence studies show that the cis-configured backbones have posed significant effects on the optical absorption and fluorescence of the polyphenylacetylenes. Upon the 325-nm excitation, the dilute solutions of these cis-polyphenylacetylenes give off weak fluorescence with their peak located at about 390 nm, but the concentrated solutions of the polymer can give off strong orange-red fluorescence with their peak located at about 600 nm. With Hückel tight binding theory, both the E-k dispersion relations and the density of states were calculated for cis-polyphenylacetylene. Our results suggest that the blue photoluminescence of polyacetylenes origins from the backbone enhanced -conjugation of the phenyl chromophors in the polymer, and that intermolecular interactions can occur in the excited complex of the polymer.

Info:

Periodical:

Key Engineering Materials (Volumes 428-429)

Edited by:

Yuan Ming Huang

Pages:

483-486

DOI:

10.4028/www.scientific.net/KEM.428-429.483

Citation:

B. G. Zhai and Y. M. Huang, "Effect of Cis-Backbone on Optical Properties of Polyphenylacetylene ", Key Engineering Materials, Vols. 428-429, pp. 483-486, 2010

Online since:

January 2010

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Price:

$35.00

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