Comparative study on thermal degradation of some new diazoaminoderivatives under air and nitrogen atmospheres

• Published in: Journal of thermal analysis and calorimetry 2011, Vol.103 (1), p.283-291
• Main Authors: Mocanu, Anca Mihaela, Odochian, Lucia, Apostolescu, N., Moldoveanu, C.
• Format: Article
• Language: English
• Subjects: Analysis; Analytical Chemistry; Atmospheres; Carbon dioxide; Chemistry; Chemistry and Materials Science; Condensed benzenic and aromatic compounds; Degradation; Endothermic reactions; Environmental impact; Exact sciences and technology; Fungicides; Hostages; Inorganic Chemistry; Measurement Science and Instrumentation; Organic chemistry; Physical Chemistry; Polymer Sciences; Preparations and properties; Residues; Thermal degradation
• ISSN: 1388-6150; 1588-2926; 1572-8943
• DOI: 10.1007/s10973-010-0857-y

The article is devoted to a comparative study on the thermal degradation of some new diazoaminoderivatives under both air and nitrogen atmosphere by TG-FTIR analysis. The TG–DTG–DTA curves show the thermal degradation in air to present two temperature domains: an endothermic one identical to the case of the degradation under nitrogen and an exothermic one which is not to be found under nitrogen atmosphere. The identification of the gaseous species released by degradation in air within the endothermic domain made evident the presence of the same components of the degradation in nitrogen atmosphere. In the exothermic domain of the sample degradation in air, the CO 2 , H 2 O, SO 2 species result by the burning of the molecular residues of the first domain. The obtained results afforded a degradation mechanism to be advanced that coincide for the endothermic domain with that of degradation under nitrogen atmosphere. Due to the importance of these compounds as possible reaction initiators and also as potentially bioactive substances (herbicides, acaricides, fungicides), the study on their thermal degradation could give useful information on the environmental impact of the degradation products resulting by the thermal processing of the plants which could possible retain these compounds, when the initial degradation temperature is exceeded.