Abstract
The pentazolate anion, as a polynitrogen species, holds great promise as a high-energy density material for explosive or propulsion applications. Designing pentazole complexes that contain minimal non-energetic components is desirable in order to increase the material’s energy density. Here, we report a solvent-free pentazolate complex, AgN5, and a 3D energetic-framework, [Ag(NH3)2]+[Ag3(N5)4]ˉ, constructed from silver and cyclo-N5ˉ. The complexes are stable up to 90 °C and only Ag and N2 are observed as the final decomposition products. Efforts to isolate pure AgN5 were unsuccessful due to partial photolytical and/or thermal-decomposition to AgN3. Convincing evidence for the formation of AgN5 as the original reaction product is presented. The isolation of a cyclo-N5ˉ complex, devoid of stabilizing molecules and ions, such as H2O, H3O+, and NH4+, constitutes a major advance in pentazole chemistry.
Highlights
The pentazolate anion, as a polynitrogen species, holds great promise as a high-energy density material for explosive or propulsion applications
Polynitrogen compounds hold great promise due to their fast energy release and eco-friendly decomposition products[4,5,6,7]. Major advances in this area have been made during the past two decades, the two most remarkable new species discovered in this field are the pentazenium cation, anion, cyclo-N5ˉ9–12
F[Aigg.(1NiHllu3)s2t]r+at[eAs gt3h(eNp5r)o4]ce.dIunrevsiefworotfheprseyvnitohuessersesoefatrhche,AoguNr 5teaanmd have achieved a breakthrough in cyclo-N5ˉ chemistry involving the synthesis and characterization of the stable pentazolate salt, (N5)6(H3O)3(NH4)4Cl1
Summary
The pentazolate anion, as a polynitrogen species, holds great promise as a high-energy density material for explosive or propulsion applications. The isolation of a cyclo-N5ˉ complex, devoid of stabilizing molecules and ions, such as H2O, H3O+, and NH4+, constitutes a major advance in pentazole chemistry. The pentazolate anion, cyclo-N5ˉ, has recently been stabilized as (N5)6(H3O)3(NH4)4Cl1 and Co(N5)2(H2O)4· 4H2O2 This discovery has received much attention due to the potential applications of cyclo-N5ˉ in high-energy density materials (HEDMs) and as a starting material for the syntheses of inorganic ferrocene analogs. These cyclo-N5ˉ complexes contained non-energetic counter ions or groups to enhance their stability, impacting their energetic properties. The isolation of a silver cyclo-N5ˉ molecules and ions, such as H2O, complex, devoid of H3O+, and NH4+, constitutes a major advance in pentazole chemistry
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