Mechanism of oxidation of phenol and 2,6-dimethylphenol in presence of Cr(phen)33+ excited state: rol of the O2

PAGLIERO, DANIELA; GERARDO A. ARGUELLO

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY

Año: 2001 vol. 138 p. 207 - 207

1010-6030

p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: normal; mso-layout-grid-align: none">Phenol and its derivatives react with the excited state of Cr(phen)33+ by electron transfer reaction. The reaction mechanism involves different steps in presence or in absence of O2. In absence of O2 and under continuous irradiation of the complex in presence of phenol (Ph) at 366 nm, no products of the oxidation were found. Results in presence of 2,6-dimethylphenol (2,6Me2Ph) indicated that direct oxidation of 2,6Me2Ph by *Cr(phen)33+ takes place. In presence of O2 the corresponding benzoquinone was obtained for both phenols. Experiences in deuterated water confirm the intermediacy of O2 (Singlet). Also, an estimation of