Chemical Research in Chinese Universities ›› 2018, Vol. 34 ›› Issue (6): 959-964.doi: 10.1007/s40242-018-8169-z

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Crystal Structures, Thermal Behavior Analysis and Thermal Safety of Two Energetic Salts of Hydrazinyl-1,2,4,5-tetrazine with 3,5-Dinitrosalicylic Acid

CHEN Xiang1, ZENG Tian1, ZHANG Cong1, GUO Zhaoqi1, LI Shuailei1, MAI Tao1, GAO Rong2, MA Haixia1   

  1. 1. School of Chemical Engineering, Northwest University, Xi'an 710069, P. R. China;
    2. College of Chemistry and Materials Science, Northwest University, Xi'an 710069, P. R. China
  • Received:2018-05-21 Online:2018-12-01 Published:2018-08-03
  • Contact: MA Haixia E-mail:mahx@nwu.edu.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China(Nos.21673179, 21504067) and the National Students' Innovation and Entrepreneurship Training Program, China(No.201710697038).

Abstract: Two energetic salts, DPHT·DNS·H2O(1) and DHT·2DNS·2H2O(2)[DPHT=3-(3,5-dimethyl-1H-pyrazol-1-yl)-6-hydrazinyl-1,2,4,5-tetrazine; DHT=3,6-dihydrazinyl-1,2,4,5-tetrazine], were synthesized from S-tetrazine with 3,5-dinitrosalicylic acid(DNS). Compounds 1 and 2 were structurally characterized by elemental analysis, infrared spectroscopy, and single-crystal X-ray diffraction. The thermal behavior of the title compounds was studied by differential scanning calorimetry(DSC) and thermogravimetry(TG). The non-isothermal decomposition kinetics of compound 2 were investigated. The self-accelerating decomposition temperature, thermal ignition temperature, and critical temperatures of thermal explosion were obtained to evaluate the thermal safety of compound 2. The results show compounds 1 and 2 decompose at 150.8 and 179.2℃, respectively. The TSADT and Tb of compound 2 are higher than those of DHT, which indicates compound 2 is a potential candidate for energetic materials that have good thermal stability.

Key words: Tetrazine compound, Dinitrosalicylic acid(DNS), Crystal structure, Thermal behavior, Thermal safety