TY - JOUR
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.
UR - http://www.scopus.com/inward/record.url?scp=0011003728&partnerID=8YFLogxK
U2 - 10.1021/j150606a018
DO - 10.1021/j150606a018
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AN - SCOPUS:0011003728
SN - 0022-3654
VL - 85
SP - 697
EP - 702
JO - Journal of Physical Chemistry
JF - Journal of Physical Chemistry
IS - 6
ER -