Zinc porphyrins photochemistry

The photophysics and photochemistry of gaseous PuFe have been ex-amined. Studies involving zinc porphyrins have been reported and include photo-oxidations in aqueous solution, photoreductions of Zn-TPP with hydrazines, and the role of Zn-TPPSa/ethyl viologen in photoredox processes. The mechanism of the photo-oxidation of water to oxygen with silver chloride has been discussed, and the synthesis of bis(chlorosilyl)-mercury compounds described. Colloidal CdSe has been shown to sensitize the photoreduction of O2 and of methyl viologen by cysteine. ... 

For example, in 1963 the photochemistry of magnesium phthalocyanine with coordinated uranium cations was studied in pyridine and ethanol and indicated the occurrence of PET to the uranium complex . A rapid photoinduced electron transfer (2-20 ps) followed by an ultrafast charge recombination was shown for various zinc and magnesium porphyrins linked to a platinum terpyridine acetylide complex . The results indicated the electronic interactions between the porphyrin subunit and the platinum complex, and underscored the potential of the linking para-phenylene bisacetylene bridge to mediate a rapid electron transfer over a long donor-acceptor distance. 

Although a number of studies of the photophysics and photochemistry of non-iV-substituted porphyrins and metalloporphyrins have been reported, there are very few studies of N-alkylporphyrins Lavsillee et al. have reported fluorescence spectra of JV-methylporphyrins and their zinc(II) complexes.3,4 There is no report on the lifetime and its correlation with the structure. Ruorescence data for iV-alkylporphyrins and their zinc(II) complexes in degassed acetonitrile are shown in Table 2. 

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