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A DSC study of new compounds based on (E)-3-(azulen-1-yldiazenyl)-1,2,5-oxadiazole

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Abstract

Exothermal decomposition of six (E)-(substituted azulen-1-yldiazenyl-1,2,5-oxadiazoles) was investigated by differential scanning calorimetry (DSC) under non-isothermal conditions, in inert atmosphere. From the DSC curves recorded either at various heating rates for three compounds, or at 10 K min−1 for the rest, several physical properties such as the melting temperature, melting heat, temperature and heat of decomposition were evaluated. The activation parameters of the decomposition processes were determined by analyzing their multiple curves, measured at different heating rates, using both the Friedman and Flynn–Wall–Ozawa isoconversional methods and model-fitting methods. The linear dependence of the activation energy on conversion supports the idea of the single-step nature of the decomposition processes for all examined compounds. The decomposition steps were identified from the experimental DSC curves, and their kinetic parameters were evaluated using linear regression methods. New insight into the relationship between melting and structural properties was gained if the equilibrium free energy of melting was splitted into its energetic and entropic components. The resulted thermodynamic and kinetic parameters are used to predict the hazards associated with these compounds.

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Acknowledgments

The present study was partially financed by the Romanian Academy under research project “Dynamics of fast oxidation and decomposition reactions in homogeneous systems” of “Ilie Murgulescu” Institute of Physical Chemistry.

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Authors and Affiliations

  1. “Ilie Murgulescu” Institute of Physical Chemistry, Romanian Academy, 202 Spl. Independentei, 060021, Bucharest, Romania

    Adina Magdalena Musuc & Domnina Razus

  2. Organic Chemistry Center “C. D. Nenitzescu”, Romanian Academy, 202B Spl. Independentei, 060023, Bucharest, Romania

    Liviu Birzan, Mihaela Cristea & Alexandru C. Razus

  3. Department of Physical Chemistry, University of Bucharest, 4-12 Regina Elisabeta Blvd, 030018, Bucharest, Romania

    Adina Magdalena Musuc & Dumitru Oancea

Authors
  1. Adina Magdalena Musuc
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  2. Liviu Birzan
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  3. Mihaela Cristea
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  4. Domnina Razus
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  5. Alexandru C. Razus
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  6. Dumitru Oancea
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Correspondence to Adina Magdalena Musuc.

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Musuc, A.M., Birzan, L., Cristea, M. et al. A DSC study of new compounds based on (E)-3-(azulen-1-yldiazenyl)-1,2,5-oxadiazole. J Therm Anal Calorim 146, 1763–1772 (2021). https://doi.org/10.1007/s10973-020-10164-5

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