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Investigation of the decomposition of compounds containing azo groups by EPR spectroscopy

✍ Scribed by A. Staško; K. Erentová; P. Rapta; O. Nuyken; B. Voit

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 809 KB
Volume: 36
Category: Article
ISSN: 0749-1581
DOI: 10.1002/(sici)1097-458x(199801)36:1<13::aid-omr200>3.0.co;2-5

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✦ Synopsis

In photochemically, electrochemically and thermally initiated decomposition, compounds containing the azo group (1RNxN2R) usually form reactive, short-lived radicals and which corresponds to synchro-1R~2R~, nous splitting. As examples, aliphatic azo compounds, 1-aryl-2-alkylazo compounds, azophosphonates, azosulfonates, azosulfones, azosulÐdes, triazenes, pentazadienes, hexazadienes, acyl-and diacylazo compounds, diazonium salts and cyclic azo compounds have been studied. and were characterized by means of the EPR spin trap 1R~2Rt echnique. These reactive radicals may abstract hydrogen from the solvent or any neighborhood functions, or dimerize (1RÈ2R). Some azo compounds trap and and thus form the corresponding hydrazyl radicals. In 1R~2Rc athodic reduction, prior to the initiation of decomposition, corresponding anion radicals centered on the azo group were observed which have considerable stability if 1R and 2R are conjugated structures.

1998 John Wiley ( & Sons, Ltd.

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