The azido-embedded nanoarchitectonics of 2D energetic coordination polymer with high energy and low sensitivities

Abstract

Recently, energetic coordination polymers (ECPs) have attracted much attention with the reinforced structure and enhanced energetic performance. In the fields of energetic materials (EMs), azido-based EMs always possess excellent detonation properties with high sensitivities. To develop novel EMs with high energy and low sensitivity simultaneously, in this study, a new azido-based ECP [Ni3(TTA)4(N3)2·2MeOH]n1 (HTTA ​= ​1H-tetrazol-1-ylacetic acid) featuring in a 2D network structure were obtained though nanoarchitectonics and a simple solvothermal method. The single crystal X-ray diffraction analysis indicates that 1 consists of Ni2+ centers and nitrogen-rich TTA– ligands with sensitive azido ions embedded in the 2D plane. Moreover, strong hydrogen bonds between carboxyl groups and MeOH molecules can further reinforce the structure and improve the stabilities. The decomposition temperature (Tdec), impact sensitivity (IS), and the friction sensitivity (FS) of 1 is 251 ​°C, >40 ​J, and 80 ​N, respectively, showing significant advantages in contrast with the reported azido-based ECPs. The calculated heat of detonation (ΔHdet) value is 3.270 ​kJ ​g−1, which is higher than that of TNT (ΔHdet ​= ​1.220 ​kJ ​g−1). According to the above analysis, compound 1 has promise to serve as EMs because of its high stability and excellent energetic performance.