Two silver energetic coordination polymers based on a new N-amino-contained ligand: Towards good detonation performance and excellent laser-initiating ability

Abstract

High-nitrogen heterocycle ligands, as an important part of energetic coordination polymers (ECPs), play a dominant role on regulating the energetic performance of ECPs. In inspire of the higher enthalpy and higher nitrogen contents after amination reaction, we synthesized a novel energetic ligand, 4-(2-amino-2H-tetrazol-5-yl)-1,2,5-oxadiazol-3-amine (ATNT), which has enhanced physicochemical properties (ΔHf: 524.2 kJ mol−1; D: 8248 m s−1; P: 24.67 GPa). Based on ATNT, two Ag-ECPs, [Ag2(ATNT)2](NO3)2 and [Ag2(ATNT)4](ClO4)2, were prepared and their structures were determined by single-crystal XRD. The high energetic performance of ATNT promotes the further improvement of the energy density of ECPs in this work. With excellent crystal densities (2.405/ 2.675 g cm−3) and high heat of detonation (0.91/ 0.88 kcal g−1), the detonation properties of two ECPs are 7286 m s−1/27.89 GPa, 8085 m s−1/40.08 GPa, respectively, which are at advanced level among the reported silver-based complexes. Moreover, laser initiation experiments show that both ECPs possess low initiation delay times (<20 μs) under 70 mJ initiation energy, revealing their potential as novel laser-initiating energetic materials. Presented ECPs in our work combine the advantages of simple synthesis method, high density, good detonation performance, excellent laser-initiating ability, exhibiting the great development potentials.