Thermal decomposition of several N,N'-bis-[alpha],[alpha]'-dinitrones

• Published in: Journal of thermal analysis and calorimetry Vol. 140; no. 2; p. 685
• Main Authors: Logvinenko, V. A, Fadeeva, V. P, Selivanov, B. A, Tikhova, V. D, Nefedov, A. A, Tikhonov, A. Ya
• Format: Journal Article
• Language: English
• Published: Springer 01.04.2020
• Subjects: Mass spectrometry
• ISSN: 1388-6150; 1588-2926
• DOI: 10.1007/s10973-019-08868-4

N,N'-Bis(2-hydroxyiminoalkyl)-[alpha],[alpha]'-dinitrones are of interest for the synthesis of 1,1'-dihydroxy-2,2'-biimidazoles. Thermal decomposition of two these dinitrones was studied in helium atmosphere. Thermal decomposition of the studied dinitrones at temperature interval 20-500 °C consists of several steps, the first step accompanying with significant exothermic effect (700-1000 J g.sup.-1). The first step has been shown to be a two-stage process, and decomposition products have been determined using chromatography-mass spectrometry. Thermogravimetric curves were used for the kinetic studies. Kinetic parameters of decomposition are estimated within the approaches of non-isothermal kinetics ("model-free" kinetics and nonlinear regression methods), with the computer program Netzsch Thermokinetics 2.