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Fluorescence spectra of polybenzamide in isotropic and nematic solutions

โœ Scribed by Fenglian Bai; Shufan Zhang; Junlin Yang; Renyuan Qian

Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
344 KB
Volume
195
Category
Article
ISSN
1022-1352

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โœฆ Synopsis

Abstract

The fluorescence spectra of polybenzamide (PBA) in N,Nโ€dimethylacetamide with 3% LiCl (A) and in 98% H~2~SO~4~ (B) solutions have been studied both in very dilute and in nematic solutions. Stacked chromophores of PBA play an important role in the formation of nematic phase. Fluorescence intensity from solution A is much higher than that from solution B under the same conditions of excitation. Differences in the fluorescence behavior of solutions A and B are discussed in regard of the monochromophore emission and monochromophore excitation and long wavelength emission. Fluorescence emission has been shown to be an extremely sensitive tool to probe some molecular species present in minute amounts, which show up readily in the excitation spectrum of fluorescence emission but escape from detection in the absorption spectrum.

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