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Fluorescence spectra of polybenzamide in isotropic and nematic solutions
Author(s) -
Bai Fenglian,
Zhang Shufan,
Yang Junlin,
Qian Renyuan
Publication year - 1994
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1994.021950313
Subject(s) - fluorescence , chromophore , liquid crystal , emission spectrum , chemistry , photochemistry , excitation , analytical chemistry (journal) , absorption (acoustics) , absorption spectroscopy , spectral line , materials science , optics , optoelectronics , organic chemistry , physics , astronomy , electrical engineering , composite material , engineering
The fluorescence spectra of polybenzamide (PBA) in N , N ‐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.