Dense Hydrogen-Bonded Assembly of Hydrogen-Rich Cations and Pentazolate Anions: A Series of Highly Insensitive Ionic Salts.

Compounds containing the pentazolate anion (-N) represent a distinctive group of energetic materials that have received extensive attention in recent years. -N was used as a polynitrogen anion for the syntheses of energetic salts through metathesis reactions. Propamidinium (), 5-amino-4-carbamoyl-1-imidazol-3-ium (), (1-1,2,3-triazol-4-yl)methanaminium (), 5-amino-4-1,2,4-triazol-1-ium (), 5-amino-3-methyl-4-1,2,4-triazol-1-ium (), and amino(pyrimidin-2-yl)methaniminium () 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 -N.