The Numerical Analysis of Electron Spin Resonance Spectra With Hyperfine Structure

Newton, R.; Schulz, K. F.; Elofson, R. M.

doi:10.1139/v66-107

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Photochemical hydroxylation of quinoxalines

Verbeek

Berends

Beek

1976

Recl. Trav. Chim. Pays‐Bas

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Abstract. Irradiation of quinoxaline (1) in acidic aqueous solution under anaerobic conditions leads to the formation of 5-hydroxyquinoxaline (4) and the 1,4-dihydroquinoxaline radical cation (5). The radical cation (5) was characterized by ESR spectroscopy.Under aerobic conditions 5-hydroxyquinoxaline (4) is the only irradiation product formed. The effect of substituents attached to the benzene nucleus of quinoxaline is analyzed.

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Photochemical hydroxylation of quinoxalines

Verbeek

Berends

Beek

1976

Recl. Trav. Chim. Pays‐Bas

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ESR investigation of the radical intermediates formed in the photoreduction of azo dyes

Heijkoop

Beek

1977

Recl. Trav. Chim. Pays‐Bas

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83In general, these experiments show the importance of the pretreatment of the CaA zeolites for the adsorption of CO. Moreover, one must be very careful in comparing CO adsorption results, because the quantity adsorbed depends largely on the pretreatment conditions of the CaA zeolite. Small changes in pretreatment can result in large adsorption J. A. Michelena acknowledges a grant from the EEC differences. Therefore, we suggest that for adsorption (European Economic Community). E. F. Vansant thanks measurements on CaA zeolites, always fresh CaA zeolite samples, dehydrated at identical temperatures for the same period of time, should be used. Abstract. ESR-spectra of hydrazyl and aminonaphthoxy radicals formed upon photoreduction of azo dyes have been measured. For the hydrazyl radicals the results obtained further confirm previous investigations of the mechanism of photoreduction of azo dyes. The direct identification in photoreduced dye solutions of aminonaphthoxy radicals, which are formed in the oxidation reduction equilibrium of aminonaphthols and iminoquinones provides strong evidence for previously proposed mechanisms for the disproportionation of hydrazyl radicals Acknowledgement

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P

Wendisch¹

1990

Acronyms and Abbreviations in Molecular Spectroscopy

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The Numerical Analysis of Electron Spin Resonance Spectra With Hyperfine Structure

Cited by 12 publications

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Photochemical hydroxylation of quinoxalines

Photochemical hydroxylation of quinoxalines

ESR investigation of the radical intermediates formed in the photoreduction of azo dyes

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