The Properties of Quintet Dinitrenes
in 2,4,6-Triazido-3,5-dichloropyridine Crystals

S. I. Kuzina, D. V. Korchagin, G. V. Shilov, A. I. Mikhailov, S. V. Chapyshev, and S. M. Aldoshin

Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432 Russia

e-mail: alfaim@icp.ac.ru

Received April 17, 2007

Abstract—The gamma radiolysis of crystalline 2,4,6-triazido-3,5-dichloropyridine (TACP) was studied by the
EPR method. The molecular and crystal structure of TACP was determined by X-ray structure analysis. The
prolonged radiolysis of TACP at 77 K caused the appearance of characteristic EPR signals of quintet 2,6-dini-
treno-4-azido-3,5-dichloropyridine (2,6-DN) and 2,4-dinitreno-6-azido-3,5-dichloropyridine (2,4-DN). The
predominant decomposition of the -azide groups of TACP was explained by the special features of its molec-
ular and crystal structure. The saturation of the EPR signals of quintet 2,6-DN and 2,4-DN and one-electron
radicals with S = 1/2 as the microwave field power increased was studied. The quintet dinitrenes were found to
be thermally unstable; they remained in TACP crystals up to 245–250 K.

DOI: 10.1134/S0036024408110149

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