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Abnormal Fluorescence Behavior of Pyrene Functionalized Chitosan Films to Some Quenchers

Abnormal Fluorescence Behavior of Pyrene Functionalized Chitosan Films to Some Quenchers Investigation of the fluorescence behavior of a pyrene functionalized chitosan film (PSC‐CS) to some quenchers, including KI, CH3NO2 and Cu(NO3)2, has revealed that the monomer emission from the PSC‐CS film increased rather than decreased, whereas the excimer emission decreased with the increase of time of duration after addition of KI or Cu(NO3)2. Both the increasing and decreasing processes could last as long as 20 min to 40 min. Unlike that observed in the system containing KI or Cu(NO3)2, for CH3NQ2 system, both the monomer emission and the excimer emission increased with introduction of the quencher, but the excimer emission only started to increase after an hour‐long induction period. The position of the excimer emission of the PSC‐CS film did not change very much with addition of KI or Cu(NO3)2. However, addition of CH3NO2 made the excimer emission blue shifted for at least 20 nm indicating formation of distorted excimers or partially overlapped excimers. The fluorescence response of the film to external additions is sensitive but is low in selectivity. This property may make the film use as a novel sensing material for monitoring the purity of water. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Chinese Journal of Chemistry Wiley

Abnormal Fluorescence Behavior of Pyrene Functionalized Chitosan Films to Some Quenchers

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References (16)

Publisher
Wiley
Copyright
Copyright © 2003 Wiley Subscription Services, Inc., A Wiley Company
ISSN
1001-604X
eISSN
1614-7065
DOI
10.1002/cjoc.20030210308
Publisher site
See Article on Publisher Site

Abstract

Investigation of the fluorescence behavior of a pyrene functionalized chitosan film (PSC‐CS) to some quenchers, including KI, CH3NO2 and Cu(NO3)2, has revealed that the monomer emission from the PSC‐CS film increased rather than decreased, whereas the excimer emission decreased with the increase of time of duration after addition of KI or Cu(NO3)2. Both the increasing and decreasing processes could last as long as 20 min to 40 min. Unlike that observed in the system containing KI or Cu(NO3)2, for CH3NQ2 system, both the monomer emission and the excimer emission increased with introduction of the quencher, but the excimer emission only started to increase after an hour‐long induction period. The position of the excimer emission of the PSC‐CS film did not change very much with addition of KI or Cu(NO3)2. However, addition of CH3NO2 made the excimer emission blue shifted for at least 20 nm indicating formation of distorted excimers or partially overlapped excimers. The fluorescence response of the film to external additions is sensitive but is low in selectivity. This property may make the film use as a novel sensing material for monitoring the purity of water.

Journal

Chinese Journal of ChemistryWiley

Published: Mar 1, 2003

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