Studies on the Photochemical Reactions Catalyzed by Metalloporphyrin Complexes(Ⅲ)─Kinetics of Photoassisted Oxidation Reaction of Methanol by Metalloporphyrins

Chem. J. Chinese Universities ›› 1994, Vol. 15 ›› Issue (9): 1280.

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Studies on the Photochemical Reactions Catalyzed by Metalloporphyrin Complexes(Ⅲ)─Kinetics of Photoassisted Oxidation Reaction of Methanol by Metalloporphyrins

YANG Guo-Yu, WANG Qing-Min, SUN Jin-Feng, ZHAO Qian YU Lian-Xhng, CAO Xi-Zhang

Department of Chemistry, Jilin University, Changchun, 130023

Received:1993-10-13 Revised:1994-06-10 Online:1994-09-24 Published:1994-09-24

Abstract

Abstract: In deaerated solution of water-methanol or water-methanol-pyridine system, trivalent ions(Co(Ⅲ)and Mn(Ⅲ))porphyrins were reduced to divalent ions on illummination of light with simultaneous oxidation of methanol. The kinetic study on the photoreduction revealed that the reduction rate of Co(Ⅲ)followed the pseudo-first-order rate expression at 20℃ and pH 2 to 13 in the presence of excess methanol. The observed rate constants were dependent on [CH₃OH] and pHvalues.The possible mechnisms for the photoreduction of metalloporphyrins were discussed.

Key words: Metalloporphyrins, Photoassisted reaction, Kinetics

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YANG Guo-Yu, WANG Qing-Min, SUN Jin-Feng, ZHAO Qian YU Lian-Xhng, CAO Xi-Zhang. Studies on the Photochemical Reactions Catalyzed by Metalloporphyrin Complexes(Ⅲ)─Kinetics of Photoassisted Oxidation Reaction of Methanol by Metalloporphyrins[J]. Chem. J. Chinese Universities, 1994, 15(9): 1280.

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Studies on the Photochemical Reactions Catalyzed by Metalloporphyrin Complexes(Ⅲ)─Kinetics of Photoassisted Oxidation Reaction of Methanol by Metalloporphyrins

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