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Photoproducts and triplet reactivity of 4′-nitro- and 2′,4′-dinitro-substituted 4-hydroxystilbenes

Paper ID Volume ID Publish Year Pages File Format Full-Text
26907 43986 2010 6 PDF Available
Title
Photoproducts and triplet reactivity of 4′-nitro- and 2′,4′-dinitro-substituted 4-hydroxystilbenes
Abstract

The properties of triplet-excited trans-4-hydroxy-4′-nitrostilbene were studied by photochemical means. This species produces singlet molecular oxygen with a quantum yield of ΦΔ = 0.4 in benzene and 0.05 in acetonitrile. Population of the triplet state was also detected by flash photolysis. The triplet yield is substantial in benzene or toluene and small in polar solvents. The major photoprocess is trans → cis isomerization, whose quantum yield is Φt-c = 0.45 in benzene and smaller in more polar media. The effects of solvent polarity on the triplet reactivity were revealed. For trans-4-hydroxy-2′,4′-dinitrostilbene, ΦΔ and Φt-c are much smaller. The photoreaction to the corresponding hydroxyphenylisatogen was examined and mechanistic aspects were discussed.

Keywords
Solvent effect; Photoisomerization; Substituent effect; Intersystem crossing; Singlet molecular oxygen
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Photoproducts and triplet reactivity of 4′-nitro- and 2′,4′-dinitro-substituted 4-hydroxystilbenes
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 214, Issues 2–3, 15 August 2010, Pages 188–193
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
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