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Issue 3, 2002

Photo-induced diacid products of octaethylporphyrin probed by resonance Raman and absorption techniques

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Abstract

The photochemical formation of di- and monoacid derivatives of octaethylporphyrin in CH2Cl2 or CCl4-N alcohol mixtures in the presence of p-benzoquinone (p-BQ) has been studied by resonance Raman and optical absorption techniques. The results clearly indicate that the solvent or co-solvent acts as the proton source in the reaction. Simultaneous presence of p-BQ and methanol is found to be essential for diacid formation in CCl4, while methanol greatly inhibits the process in CH2Cl2 solvent. However, in the presence of excess methanol in CH2Cl2 and p-BQ, porphyrin monoacid is formed. A chain mechanism is proposed for the photon-induced formation of octaethylporphyrin diacid products.

Article information


Submitted
21 Jun 2001
Accepted
16 Oct 2001
First published
07 Feb 2002

New J. Chem., 2002,26, 342-346
Article type
Paper

Photo-induced diacid products of octaethylporphyrin probed by resonance Raman and absorption techniques

H. H. Thanga and A. L. Verma, New J. Chem., 2002, 26, 342 DOI: 10.1039/B105450N

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