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Synthesis and photochromic reaction kinetics of unsaturated spiropyran derivatives

Paper ID Volume ID Publish Year Pages File Format Full-Text
27407 44020 2013 7 PDF Available
Title
Synthesis and photochromic reaction kinetics of unsaturated spiropyran derivatives
Abstract

•New 6-nitro-substituted spiropyrans have been synthesized.•We studied spectral-kinetic properties of intermediates of spiropyran vinylogs.•Nanosecond laser flash photolysis techniques were used for investigation.•Relative quantum yields of different intermediates formation have been measured.

The absorption spectra and decay kinetics of the ground and triplet states of merocyanine (MC) form of spiropyran vinylogs have been investigated by nanosecond laser flash photolysis techniques in toluene and ethanol. The 3MC decays to the ground state MC either by quenching with O2 or due to the intersystem crossing. Relative quantum yield of both 3MC and MC drastically decreases when the terminal polar group is separated from the indoline moiety by the CC-linker. In the presence of the CC-linker the replacement of terminal CN by CHO has no effect. The yield of 3MC and corresponding MC in ethanol is 5 times smaller than that in toluene solution.

Keywords
Photochromism; Spiropyran; Laser flash photolysis
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Synthesis and photochromic reaction kinetics of unsaturated spiropyran derivatives
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 270, 15 October 2013, Pages 60–66
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Don't Miss Today's Special Offer
Price was $35.95
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