Journal of the Chemical Society Faraday Transactions 1 Physical Chemistry in Condensed Phases · 1982 · 54 citations · 0 references
Natural SciencesChemistryChemical KineticsMolecular PhysicsSpectroscopyPhotochemical KineticsPhotochemistrySpectroscopy Of BiomoleculesExcited Electronic StatesExcited StatesIrradiation EffectsLaser Flash PhotolysisPorphyrin OxidationPulse RadiolysisTriplet States
Nanosecond laser flash photolysis and pulse radiolysis have been used to characterise the excited states and radicals of meso-tetraphenylporphyrin tetrasulphonic acid as the tetrasodium salt (Na4TPPS) and of meso-tetra-N-methylpyridylporphyrin as the tetra-p-toluenesulphonate (TMPyrP). After 347 nm irradiation, aqueous Na4TPPS forms triplet states (ϕT= 0.76) and photoionises monophotonically (ΦI= 0.029), while TMPyrP forms only triplets (ΦT= 0.92) and does not photoionise. The difference and corrected spectra of the triplet states and the semi-oxidised and semi-reduced radicals of these molecules have been obtained.