Studies on the ESR Spectra of Dawson-Molybdovanadophosphonic Compound in the Process of Phenol Hydroxylation

Chem. J. Chinese Universities ›› 1997, Vol. 18 ›› Issue (3): 434.

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Studies on the ESR Spectra of Dawson-Molybdovanadophosphonic Compound in the Process of Phenol Hydroxylation

ZHENG Ying-Guang¹, YU Jian-Feng³, DONG Feng-Xia¹, YANG Yu², WU Tong-Hao², SUN Chia-Chung³

1. The Center of Analysis and Testing, Jilin University, Changchun, 13O023;
2. Department of Chemistry, Jilin University, Changchun, 13O023;
3. Institute of Theory Chemistry, Jilin University, Changchun, 13O023

Received:1996-04-10 Online:1997-03-24 Published:1997-03-24

Abstract

Abstract: ESRspectra of molybdovanadophosphonic compound with Dawson structure in the process of phenol hydroxylation with H₂O₂ were studied.Contrasting their ESRparameters at different reaction time, the change of V⁴⁺V⁵⁺ in the system was analyzed.The results indicated that in the initial stage, a few V⁴⁺ were produced in the process of the catalyst synthesized.After two hours, the amount of V⁴⁺ increased quickly and two kinds of signals of V⁴⁺, V(Ⅰ) and V(Ⅱ) appeared-The ESRparameters of V(Ⅰ) were the same as ones at the initial stage, but the signals of V (Ⅰ) were newly appeared.The increasing amount of V(Ⅱ) is higher than that of V(Ⅰ).We had calcuIated the de1ocalized extent of unpaired electrons by the method of Abragam Pryce and assigned that two kinds of V⁴⁺, V (Ⅰ) and V(Ⅱ) are all the active centre of the reaction.

Key words: Heteropolycompound with Dawson structure, Hydroxylation of phenol, ESR, V⁴⁺ions

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ZHENG Ying-Guang, YU Jian-Feng, DONG Feng-Xia, YANG Yu, WU Tong-Hao, SUN Chia-Chung. Studies on the ESR Spectra of Dawson-Molybdovanadophosphonic Compound in the Process of Phenol Hydroxylation[J]. Chem. J. Chinese Universities, 1997, 18(3): 434.

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Studies on the ESR Spectra of Dawson-Molybdovanadophosphonic Compound in the Process of Phenol Hydroxylation

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