Dependence of the thioxanthone triplet-triplet absorption spectrum with solvent polarity and aromatic ring substitution

Dependence of the thioxanthone triplet-triplet absorption spectrum with solvent polarity and aromatic ring substitution

The triplet-triplet (TT) and transient absorptions of non-substituted and substituted thioxanthones has been studied in different solvents in order to ascertain the effect of the solvent, as well as the substituents on the aromatic ring. Spectra taken after a couple of ms after the flash show three main transient absorptions due to the triplet state (600-650 nm), the thioxanthone ketyl radical (~450 nm) and an overlap of both (~300 nm). The amount of radicals formed in non hydroxylic solvents is much lower than in alcohols. The maxima of the TT absorption peaks show a good correlation with the E T(30) solvent parameter.

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Main Authors: Ferreira,Giovana C., Schmitt,Carla C., Neumann,Miguel G.
Format: Digital revista
Language:English
Published: Sociedade Brasileira de Química 2006
Online Access:http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532006000500013
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spelling oai:scielo:S0103-505320060005000132006-12-01Dependence of the thioxanthone triplet-triplet absorption spectrum with solvent polarity and aromatic ring substitutionFerreira,Giovana C.Schmitt,Carla C.Neumann,Miguel G. thioxanthone triplet-triplet absorption The triplet-triplet (TT) and transient absorptions of non-substituted and substituted thioxanthones has been studied in different solvents in order to ascertain the effect of the solvent, as well as the substituents on the aromatic ring. Spectra taken after a couple of ms after the flash show three main transient absorptions due to the triplet state (600-650 nm), the thioxanthone ketyl radical (~450 nm) and an overlap of both (~300 nm). The amount of radicals formed in non hydroxylic solvents is much lower than in alcohols. The maxima of the TT absorption peaks show a good correlation with the E T(30) solvent parameter.info:eu-repo/semantics/openAccessSociedade Brasileira de QuímicaJournal of the Brazilian Chemical Society v.17 n.5 20062006-10-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532006000500013en10.1590/S0103-50532006000500013
institution SCIELO
collection OJS
country Brasil
countrycode BR
component Revista
access En linea
databasecode rev-scielo-br
tag revista
region America del Sur
libraryname SciELO
language English
format Digital
author Ferreira,Giovana C.
Schmitt,Carla C.
Neumann,Miguel G.
spellingShingle Ferreira,Giovana C.
Schmitt,Carla C.
Neumann,Miguel G.
Dependence of the thioxanthone triplet-triplet absorption spectrum with solvent polarity and aromatic ring substitution
author_facet Ferreira,Giovana C.
Schmitt,Carla C.
Neumann,Miguel G.
author_sort Ferreira,Giovana C.
title Dependence of the thioxanthone triplet-triplet absorption spectrum with solvent polarity and aromatic ring substitution
title_short Dependence of the thioxanthone triplet-triplet absorption spectrum with solvent polarity and aromatic ring substitution
title_full Dependence of the thioxanthone triplet-triplet absorption spectrum with solvent polarity and aromatic ring substitution
title_fullStr Dependence of the thioxanthone triplet-triplet absorption spectrum with solvent polarity and aromatic ring substitution
title_full_unstemmed Dependence of the thioxanthone triplet-triplet absorption spectrum with solvent polarity and aromatic ring substitution
title_sort dependence of the thioxanthone triplet-triplet absorption spectrum with solvent polarity and aromatic ring substitution
description The triplet-triplet (TT) and transient absorptions of non-substituted and substituted thioxanthones has been studied in different solvents in order to ascertain the effect of the solvent, as well as the substituents on the aromatic ring. Spectra taken after a couple of ms after the flash show three main transient absorptions due to the triplet state (600-650 nm), the thioxanthone ketyl radical (~450 nm) and an overlap of both (~300 nm). The amount of radicals formed in non hydroxylic solvents is much lower than in alcohols. The maxima of the TT absorption peaks show a good correlation with the E T(30) solvent parameter.
publisher Sociedade Brasileira de Química
publishDate 2006
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532006000500013
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AT schmittcarlac dependenceofthethioxanthonetriplettripletabsorptionspectrumwithsolventpolarityandaromaticringsubstitution
AT neumannmiguelg dependenceofthethioxanthonetriplettripletabsorptionspectrumwithsolventpolarityandaromaticringsubstitution
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