Facile Synthesis and Accelerated Combustion Effect of Micro-/Nanostructured Amorphous and Crystalline Metal Coordination Compounds Based on N,N‑Bis[1H‑tetrazol-5-yl]amine

Energetic coordination compounds (ECCs) based on nitrogen-rich heterocycles has continued to attract considerable attention owing to their great potential in military and civilian fields. Besides the components, micro-/nanostructures and solid states also play a significant role in tuning the performance of energetic coordination compounds. Herein, Na­(Hbta)­(H2 bta)­(H2O)3 (1) was synthesized through the optimized hydrothermal reaction of sodium dicyanamide and sodium azide in the presence of acetic acid. Its structure was further confirmed by single-crystal X-ray diffraction analysis. Then, five micro-/nanostructured metal-Hbta complexes were prepared via mild metathesis reaction and then freeze-drying technology. These as-prepared materials exhibit different solid states and show insensitivity to external mechanical stimuli (impact sensitivity, >40 J; friction sensitivity, >360 N). Additionally, they possessed outstanding performance in accelerating ammonium perchlorate (AP) thermal decomposition by decreasing the high-temperature decomposition temperature from 429.4 to 303.8 °C and markedly increasing the heat release from 853 to 3423 J/g. The results indicate that as-prepared materials could be regarded as promising bifunctional additives for AP thermal decomposition, which may enrich methodologies for the combustion promoter in AP-based solid propellants.