Journal
NEW JOURNAL OF CHEMISTRY
Volume 48, Issue 2, Pages 811-818Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d3nj04910h
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Balancing energy and mechanical sensitivities is a challenging issue in the field of energetic materials. This study constructed a 3D energetic metal-organic framework with nitrogen-rich ligand and NO3- anions. The framework demonstrated high stability, energy density, and excellent mechanical sensitivities, making it a potential insensitive energetic material.
Balancing the conflict between energy and mechanical sensitivities is still one of the most challenging issues in the field of energetic materials (EMs). The NO3- anion has attracted widespread attention in the preparation of EMs because of rich oxygen contents and excellent energy densities. In this work, a 3D energetic metal-organic framework (EMOF) {[Zn-2(mu(2)-OH)(datz)(2)(H2O)](NO3)}(n) 1 (Hdatz = 3,5-diamino-1,2,4-triazole) was constructed by chelating the nitrogen-rich Hdatz ligand and NO3- anions. The structural analysis demonstrates that the Hdatz ligand chelated with surrounding binuclear metal centers to construct [Zn-O-Zn] structural units, resulting in the formation of highly stable five-membered fused rings, which contribute to the construction of a 3D cationic framework. Additionally, free NO3- anions are encapsulated by the cationic 3D frameworks and stabilized by robust hydrogen-bonding interactions in the channels. The values of enthalpy of formation (Delta H-f degrees) and heat of detonation (Delta H-det) of 1 are high up to 3478 kJ mol(-1) and 5.316 kJ g(-1). In addition, compound 1 has a relatively good thermal decomposition temperature of 161 degrees C and excellent low impact (IS > 40 J) and friction (FS >360 N) sensitivities. These results demonstrate that 1 can serve as a potential insensitive EM. This unique structural feature also presents an effective reference for developing advanced EMs.
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