Thermal stability of 3,4,5-trinitropyrazole and its ammonium salt View Full Text


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Article Info

DATE

2015-03

AUTHORS

V. V. Dubikhin, G. M. Nazin, V. G. Prokudin, Z. G. Aliev, I. L. Dalinger, S. A. Shevelev

ABSTRACT

The thermal decomposition of trinitropyrazole (I) and its ammonium salt proceeds with a very strong self-acceleration, caused mainly by the catalytic action of the condensed products. The first-order rate constant for the initial stage k1 describes the decomposition to a depth of conversion of 0.5% and is characterized by the following kinetic parameters E (kJ/mol) and log(A, s−1): 131.8 and 9.60 for the liquid phase and 116.0 and 8.57 for the solid state. The rate constant k1 is smaller if the reaction occurs in nonpolar solvents and if I is methylated at position 1. All these data are interpreted in the framework of a mechanism according to which the reaction involves the oxidation by a nitro group of a neighboring carbon atom and proceeds through a highly polar cyclic transition state. Evaluation of the thermal stability of I is conducted using the method of a reference series composed of well-known regular HEs, which for the first time was implemented in terms of k1. In the temperature range 20–80°C, the stability of trinitropyrazole is close to that of nitroglycerin. Trinitropyrazole ammonium salt is severalfold more stable than trinitropyrazole itself. More... »

PAGES

211-217

References to SciGraph publications

  • 2010-12-17. Chemistry and thermal decomposition of trinitropyrazoles in JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
  • 2013-06. Relation between the N-NO2 bond length and stability of the secondary nitramines in RUSSIAN JOURNAL OF GENERAL CHEMISTRY
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