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Synthesis, structure analysis and thermodynamics of [Ni(H2O)4(TO)2](NO3)2·2H2O (TO = 1,2,4-triazole-5-one)

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Abstract

A novel complex [Ni(H2O)4(TO)2](NO3)2·2H2O (TO = 1,2,4-triazole-5-one) was synthesized and structurally characterized by X-ray crystal diffraction analysis. The decomposition reaction kinetic of the complex was studied using TG-DTG. A multiple heating rate method was utilized to determine the apparent activation energy (E a) and pre-exponential constant (A) of the former two decomposition stages, and the values are 109.2 kJ mol−1, 1013.80 s−1; 108.0 kJ mol−1, 1023.23 s−1, respectively. The critical temperature of thermal explosion, the entropy of activation (ΔS ≠), enthalpy of activation (ΔH ≠) and the free energy of activation (ΔG ≠) of the initial two decomposition stages of the complex were also calculated. The standard enthalpy of formation of the new complex was determined as being −1464.55 ± 1.70 kJ mol−1 by a rotating-bomb calorimeter.

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Acknowledgements

We gratefully acknowledge the financial support from the National Natural Science Foundation of China (Grant Nos. 20771089 and 20813100), the National Natural Science Foundation of Shaanxi Province (Grant Nos. 2007B02 and SJ08B09), the Educational Committee of Shaanxi Province (No. 08JK459) and the Science and Technology Foundation of the National Defense Key Laboratory of Propellant and Explosive Combustion of China (Grant No. 51455010105QT3001).

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Authors and Affiliations

  1. Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry & Materials Science, Northwest University, 710069, Xi’an, Shaanxi, People’s Republic of China

    San-Ping Chen, Na Li, Qing Wei & Sheng-Li Gao

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  1. San-Ping Chen
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  2. Na Li
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  3. Qing Wei
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Correspondence to Sheng-Li Gao.

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Chen, SP., Li, N., Wei, Q. et al. Synthesis, structure analysis and thermodynamics of [Ni(H2O)4(TO)2](NO3)2·2H2O (TO = 1,2,4-triazole-5-one). J Therm Anal Calorim 100, 1115–1120 (2010). https://doi.org/10.1007/s10973-009-0400-1

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