Front Cover: Stabilization of the Pentazolate Anion in Three Anhydrous and Metal‐Free Energetic Salts (Chem. Asian J. 8/2018)

The front cover indicates that three anhydrous, metal‐free energetic salts based on cyclo ‐N 5 − 3,9‐diamino‐6,7‐dihydro‐5 H‐bis([1,2,4]triazolo)[4,3‐e:3′,4′‐g][1,2,4,5] tetrazepine‐2,10‐diium, N ‐carbamoylguanidinium, and oxalohydrazinium (oxahy + ) pentazolate were synthesized and fully characterized. Single‐crystal X‐ray structure analyses revealed the distinctive stabilization mechanism of the cyclo ‐N 5 − in anhydrous, metal‐free solid phase. These salts had acceptable thermal stability, positive heats of formation and good detonation performance. This work highlights cyclo ‐N 5 − as a next‐generation energetic building block. More information can be found in the Communication by Pengcheng Wang, Ming Lu et al. on page 924 in Issue 8, 2018 (DOI: 10.1002/asia.201800187).