Properties of excited tetrakis(sulfonatophenyl)porphyrin in aqueous solutions. Photoredox reactions with quenchers

Gad S. Nahor; Joseph Rabani; Franz Grieser

doi:10.1021/j150606a018

Properties of excited tetrakis(sulfonatophenyl)porphyrin in aqueous solutions. Photoredox reactions with quenchers

Gad S. Nahor
, Joseph Rabani^*
, Franz Grieser

^*Corresponding author for this work

Institute of Chemistry

Research output: Contribution to journal › Article › peer-review

36 Scopus citations

Abstract

Aqueous solutions of tetrakis(sulfonatophenyl)porphyrin (TPPS) have been investigated by using both steady-state and laser pulse photolysis. The spectrum and the lifetime of the triplet state of TPPS, T₁, are reported. T₁ is quenched by O₂, p-benzoquinone (BQ), and nitrobenzene (NB) by second-order reactions. The rate constants were measured. The quenching of T₁ by BQ and NB results in electron transfer products while O₂ reacts by energy transfer. Possible reaction mechanisms, including the back-reactions, were investigated. The lowest excited singlet of TPPS, S₁, was also studied. Its emission spectrum and lifetime were measured, and the effect of quenchers was studied. The results are discussed in the light of work carried out previously in porphyrin solutions, and in relation to its potential use as a mediator in photochemical generation of H₂.

Original language	English
Pages (from-to)	697-702
Number of pages	6
Journal	Journal of Physical Chemistry
Volume	85
Issue number	6
DOIs	https://doi.org/10.1021/j150606a018
State	Published - 1981

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title = "Properties of excited tetrakis(sulfonatophenyl)porphyrin in aqueous solutions. Photoredox reactions with quenchers",

abstract = "Aqueous solutions of tetrakis(sulfonatophenyl)porphyrin (TPPS) have been investigated by using both steady-state and laser pulse photolysis. The spectrum and the lifetime of the triplet state of TPPS, T1, are reported. T1 is quenched by O2, p-benzoquinone (BQ), and nitrobenzene (NB) by second-order reactions. The rate constants were measured. The quenching of T1 by BQ and NB results in electron transfer products while O2 reacts by energy transfer. Possible reaction mechanisms, including the back-reactions, were investigated. The lowest excited singlet of TPPS, S1, was also studied. Its emission spectrum and lifetime were measured, and the effect of quenchers was studied. The results are discussed in the light of work carried out previously in porphyrin solutions, and in relation to its potential use as a mediator in photochemical generation of H2.",

author = "Nahor, \{Gad S.\} and Joseph Rabani and Franz Grieser",

year = "1981",

doi = "10.1021/j150606a018",

language = "אנגלית",

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pages = "697--702",

journal = "Journal of Physical Chemistry",

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T1 - Properties of excited tetrakis(sulfonatophenyl)porphyrin in aqueous solutions. Photoredox reactions with quenchers

AU - Nahor, Gad S.

AU - Rabani, Joseph

AU - Grieser, Franz

PY - 1981

Y1 - 1981

N2 - Aqueous solutions of tetrakis(sulfonatophenyl)porphyrin (TPPS) have been investigated by using both steady-state and laser pulse photolysis. The spectrum and the lifetime of the triplet state of TPPS, T1, are reported. T1 is quenched by O2, p-benzoquinone (BQ), and nitrobenzene (NB) by second-order reactions. The rate constants were measured. The quenching of T1 by BQ and NB results in electron transfer products while O2 reacts by energy transfer. Possible reaction mechanisms, including the back-reactions, were investigated. The lowest excited singlet of TPPS, S1, was also studied. Its emission spectrum and lifetime were measured, and the effect of quenchers was studied. The results are discussed in the light of work carried out previously in porphyrin solutions, and in relation to its potential use as a mediator in photochemical generation of H2.

AB - Aqueous solutions of tetrakis(sulfonatophenyl)porphyrin (TPPS) have been investigated by using both steady-state and laser pulse photolysis. The spectrum and the lifetime of the triplet state of TPPS, T1, are reported. T1 is quenched by O2, p-benzoquinone (BQ), and nitrobenzene (NB) by second-order reactions. The rate constants were measured. The quenching of T1 by BQ and NB results in electron transfer products while O2 reacts by energy transfer. Possible reaction mechanisms, including the back-reactions, were investigated. The lowest excited singlet of TPPS, S1, was also studied. Its emission spectrum and lifetime were measured, and the effect of quenchers was studied. The results are discussed in the light of work carried out previously in porphyrin solutions, and in relation to its potential use as a mediator in photochemical generation of H2.

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SN - 0022-3654

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JO - Journal of Physical Chemistry

JF - Journal of Physical Chemistry

IS - 6

ER -

Properties of excited tetrakis(sulfonatophenyl)porphyrin in aqueous solutions. Photoredox reactions with quenchers

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