1-Hydroxy-1,2,3,4-tetrazole and its transition metal complexes: A family of green high-energy catalysts for ammonium perchlorate

Hydroxytetrazole (OH-Tz), a nitrogen-rich and high-energy ligand, was synthesized in this study. Its single crystal structure was obtained, and its thermal stability was studied. This compound had good thermal stability and variable coordination sites. With OH-Tz as ligands and environment-friendly transition metals as coordination centers, four transition metal complexes, namely, [Mn(OH-Tz)₂(H₂O)₄]_n, [Co(OH-Tz)₂(H₂O)₄]_n, [Ni(OH-Tz)₂(H₂O)₄]_n, and [Zn(OH-Tz)₂(H₂O)₄]_n, were constructed, and their structures were identified by single crystal diffraction. Thermal analysis and sensitivity analysis results indicate their good stability, excellent energy performance, and good stability. Additionally, the addition of 10 wt% of [Co(OH-Tz)₂(H₂O)₄]_n can advance the high-temperature decomposition peak of ammonium perchlorate (AP) by 115 K and reduce the activation energy by 37 kJ mol^-1. This material is a green high-energy catalyst with good performance.