Synthesis of AgN<sub>5</sub> and its extended 3D energetic framework.
basic_science · Level V
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- Record sourced from PubMed, PMID 29593262.
- Also identified by DOI 10.1038/s41467-018-03678-y and PMC identifier 5871778.
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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, AgN<sub>5</sub>, and a 3D energetic-framework, [Ag(NH<sub>3</sub>)<sub>2</sub>]<sup>+</sup>[Ag<sub>3</sub>(N<sub>5</sub>)<sub>4</sub>]-, constructed from silver and cyclo-N<sub>5</sub>-. The complexes are stable up to 90 °C and only Ag and N<sub>2</sub> are observed as the final decomposition products. Efforts to isolate pure AgN<sub>5</sub> were unsuccessful due to partial photolytical and/or thermal-decomposition to AgN<sub>3</sub>. Convincing evidence for the formation of AgN<sub>5</sub> as the original reaction product is presented. The isolation of a cyclo-N<sub>5</sub>- complex, devoid of stabilizing molecules and ions, such as H<sub>2</sub>O, H<sub>3</sub>O<sup>+</sup>, and NH<sub>4</sub><sup>+</sup>, constitutes a major advance in pentazole chemistry.