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Fluorescence properties of the derivatives of oxazolo[4,5-b]pyridyne

Paper ID Volume ID Publish Year Pages File Format Full-Text
27887 44048 2007 9 PDF Available
Title
Fluorescence properties of the derivatives of oxazolo[4,5-b]pyridyne
Abstract

The fluorescence behaviour of a family of new dyes based on the oxazolo[4,5-b]pyridine ring has been investigated. It was found that introduction of electron withdrawing and electron donating groups into the oxazolo[4,5-b]pyridine molecule causes an increase of the ground and excited state dipole moments. The observed fluorescence has a strong charge transfer character and was investigated in terms of radiative back electron transfer theory. In water–acetonitrile solutions the compounds behave as bases forming fluorescing cations in the presence of inorganic acid. The protonation centres are different depending on the substituent. In the case of 2-(4-N,N-diethylaminophenyl)oxazolo[4,5-b]pyridine the protonation is complex and formation of a bication of this compound has been determined. These observations are consistent with quantum chemical calculations.

Keywords
Electron transfer; Fluorescence; Actinometric titration; Foerster cycle
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Fluorescence properties of the derivatives of oxazolo[4,5-b]pyridyne
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 192, Issues 2–3, 15 December 2007, Pages 188–196
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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