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1983•Journal of the Chemical Society Faraday Transactions 2 Molecular and Chemical PhysicsOpen access

Photochemistry and sensitized evolution of hydrogen from water using water-soluble cationic porphyrins. Tetrakis(trimethylaminophenyl)porphyrinatozinc and its free base

Kuppuswamy Kalyanasundaram

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Abstract

Photophysical properties (fluorescence spectra, lifetimes, triplet–triplet absorption spectra, triplet lifetimes and quantum yields) and redox potentials have been measured for the free-base, Zn2+ derivatives of a cationic water-soluble porphyrin, tetrakis(trimethyl-aminophenyl)porphyrin [TAPP(4+)]; the values are similar to those of tetrakis(sulphonatophenyl)porphyrin, TPPS(4 –). The zinc porphyrin ZnTAPP undergoes facile photoredox reactions and also sensitizes H2 evolution upon visible-light photolysis in ‘sacrificial’ systems, albeit with a lower efficiency in comparison with tetrakis(4-methylpyridyl)porphyrin, ZnTMPyP.

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Photophysical properties (fluorescence spectra, lifetimes, triplet–triplet absorption spectra, triplet lifetimes and quantum yields) and redox potentials have been measured for the free-base, Zn2+ derivatives of a cationic water-soluble porphyrin, tetrakis(trimethyl-aminophenyl)porphyrin [TAPP(4+)]; the values are similar to those of tetrakis(sulphonatophenyl)porphyrin, TPPS(4 –). The zinc porphyrin ZnTAPP undergoes facile photoredox reactions and also sensitizes H2 evolution upon visible-light photolysis in ‘sacrificial’ systems, albeit with a lower efficiency in comparison with tetrakis(4-methylpyridyl)porphyrin, ZnTMPyP.

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Available abstract

Photophysical properties (fluorescence spectra, lifetimes, triplet–triplet absorption spectra, triplet lifetimes and quantum yields) and redox potentials have been measured for the free-base, Zn2+ derivatives of a cationic water-soluble porphyrin, tetrakis(trimethyl-aminophenyl)porphyrin [TAPP(4+)]; the values are similar to those of tetrakis(sulphonatophenyl)porphyrin, TPPS(4 –). The zinc porphyrin ZnTAPP undergoes facile photoredox reactions and also sensitizes H2 evolution upon visible-light photolysis in ‘sacrificial’ systems, albeit with a lower efficiency in comparison with tetrakis(4-methylpyridyl)porphyrin, ZnTMPyP.

Key concepts: Porphyrin, Photochemistry, Free base, Cationic polymerization, Chemistry, Quantum yield, Photodissociation, Fluorescence

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Photochemistry and sensitized evolution of hydrogen from water using water-soluble cationic porphyrins. Tetrakis(trimethylaminophenyl)porphyrinatozinc and its free base — Research Paper | ScholarLens