Photophysical Properties and Photoreduction of 5,10,15,20-Tetrakis-(4-N-Methylpyridyl)Porphyrin in Formamide |
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Authors: | N N Kruk A A Korotkii |
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Institution: | (1) Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, 70 F. Skorina Ave., Minsk, 220072, Belarus |
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Abstract: | The photophysical characteristics and photochemical conversions of 5,10,15,20-tetrakis-(4-N-methylpyridyl)porphyrin in a highly polar solvent, formamide, are investigated. It has been established that no photochemical reactions occur on excitation in the visible spectral region, while UV excitation ( = 347 nm) causes photoreduction of porphyrin molecules followed by the formation of protonated products. The solvent molecules serve as a reducing agent. Photoreduction occurs in both air-saturated and deoxygenated solutions, but the nature of the products formed is different: chlorin molecules are formed in the air-saturated solutions and the successive photoconversion porphyrinphlorinporphometheneporphyrinogene occurs in the deoxygenated solutions. |
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Keywords: | porphyrin photoreduction unsteady absorption spectrum |
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