Dense Hydrogen-Bonded Assembly of Hydrogen-Rich Cations and Pentazolate Anions: A Series of Highly Insensitive Ionic Salts
Compounds containing the pentazolate anion (<i>cyclo</i>-N<sub>5</sub><sup>−</sup>) represent a distinctive group of energetic materials that have received extensive attention in recent years. <i>Cyclo</i>-N<sub>5</sub><sup>−</sup&...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-06-01
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| Series: | Molecules |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1420-3049/30/12/2613 |
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| Summary: | Compounds containing the pentazolate anion (<i>cyclo</i>-N<sub>5</sub><sup>−</sup>) represent a distinctive group of energetic materials that have received extensive attention in recent years. <i>Cyclo</i>-N<sub>5</sub><sup>−</sup> was used as a polynitrogen anion for the syntheses of energetic salts through metathesis reactions. Propamidinium (<b>1</b>), 5-amino-4-carbamoyl-1<i>H</i>-imidazol-3-ium (<b>2</b>), (1<i>H</i>-1,2,3-triazol-4-yl)methanaminium (<b>3</b>), 5-amino-4<i>H</i>-1,2,4-triazol-1-ium (<b>4</b>), 5-amino-3-methyl-4<i>H</i>-1,2,4-triazol-1-ium (<b>5</b>), and amino(pyrimidin-2-yl)methaniminium (<b>6</b>) pentazolates were obtained with high yields (>80%), and their crystal structures were confirmed through single-crystal X-ray diffraction analyses. Hirshfeld surface analyses and 2D fingerprint plots generated by CrystalExplorer17 demonstrated that these compounds exhibited extensive hydrogen-bonding networks in their crystal packing. Mechanical sensitivity tests showed that all the prepared salts were highly insensitive (IS > 35 J, FS > 360 N), providing valuable insights for the further exploration of broader energetic materials containing <i>cyclo</i>-N<sub>5</sub><sup>−</sup>. |
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| ISSN: | 1420-3049 |