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Photobehaviour of diarylethenes with thiophenes as aryl groups and dithiole-2-thione and dithiole-2-one at the ethenic bond

Paper ID Volume ID Publish Year Pages File Format Full-Text
28183 44063 2007 8 PDF Available
Title
Photobehaviour of diarylethenes with thiophenes as aryl groups and dithiole-2-thione and dithiole-2-one at the ethenic bond
Abstract

Four diarylethenes, which were expected to be thermally irreversible photochromic compounds, containing thiophene groups as aryls and dithiole-2-thione or dithiole-2-one at the ethenic bond, were investigated by steady state and time-resolved spectroscopy to obtain information about their photochemistry and the competitive relaxation paths of their electronically excited states. Only for the 4,5-bis(2-methyl-1-benzothien-3-yl)-1,3-dithiole-2-thione (BTDT), a good photochromic response was observed. The photocolouration reaction was undetectable for the 4,5-bis(2,5-dimethylthien-3-yl)-1,3-dithiole-2-thione (TDT), whereas for the two analogous compounds with oxygen (-ones) the occurrence of side reactions reduced their photochromic properties. For the photoreactive compounds, the quantum yields of the UV-photoinduced ring-closing reaction and the visible-stimulated cycloreversion reaction were determined. Nanosecond time-resolved experiments showed the formation of transients which were assigned to n, π* triplets for thiones and π, π* triplets for ones, respectively. 1H NMR measurements allowed the equilibrium ratio between parallel and antiparallel conformations for the benzo-annellated compounds to be determined.

Keywords
Photochromism; Diarylethenes; Kinetic analysis
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Photobehaviour of diarylethenes with thiophenes as aryl groups and dithiole-2-thione and dithiole-2-one at the ethenic bond
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 188, Issue 1, 30 April 2007, Pages 90–97
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
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us