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Photochromism of 8-thienyl-naphthopyrans investigated by NMR spectroscopy

Paper ID Volume ID Publish Year Pages File Format Full-Text
28531 44080 2006 6 PDF Available
Title
Photochromism of 8-thienyl-naphthopyrans investigated by NMR spectroscopy
Abstract

The photochromism of four 8-thienyl-naphthopyrans substituted either directly or via an acetylenic bridge to one or two thienyl groups, has been investigated by NMR spectroscopy. The two expected transoid photomerocyanines TC (transoid-cis) and TT (transoid-trans) have been characterised. From the numerical analysis of the kinetics recorded during photocolouration under UV irradiation and during thermal relaxation in the dark, several kinetic parameters related to the photochemical and thermal isomerization processes were determined. Their relative values are discussed and compared to two H-substituted parent compounds.

Keywords
Photochromism; Naphthopyrans; NMR spectroscopy; Kinetic analysis
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Photochromism of 8-thienyl-naphthopyrans investigated by NMR spectroscopy
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 181, Issues 2–3, 31 July 2006, Pages 174–179
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Price was $35.95
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