**Acknowledgement**

The authors gratefully acknowledge Vasily Sen' for providing of nitroxide radicals and hydroxylamines that were applied in this work. The experimental part was carried out on equipment of the Scientific and educational center «Physical organic chemistry» and the Center for collective usage of scientific equipment for diagnostics of micro and nanostructures of Yaroslavl State Univercity. The work was financially supported by Ministry of Education and Science of the Russian Federation (contracts N. 02.740.11.0636, 29.03.2010 and N. 16.552.11.7006, 29.04.2011).

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