Solid-state electrolytes attract great attention due to their advantages in safety, electrochemical stability and battery packaging. High-voltage cathode materials and the Li metal anode further increase the energy density and electrochemical cycling properties.

Metal pentazolate hydrates have attracted attention because of the unique stabilization mechanisms of cyclo-N 5 À anions during crystal stacking. However, coordinated H 2 O molecules influence the stability of cyclo-N 5 À anion-containing salts, and the structure-property relationship of high-valent cobalt pentazolate salts has not been previously reported. Werner-type cobalt(III) cations that trap cyclo-N 5 À anions, a novel class of cyclo-N 5 À -based materials, were prepared and characterized by infrared spectroscopy, elemental analysis, electrospray ionization mass spectrometry, and thermogravimetry with differential scanning calorimetry. The [Co(NH 3 ) 5 (NO 2 )] 2 + cation was also introduced via metathesis reactions to compare the intermolecular interactions in its intriguing structures. Single-crystal Xray diffraction revealed extensive hydrogen bonding networks in hexaamminecobalt(III) and nitropentamminecobalt(III) cyclo-N 5À salts between cyclo-N 5 À anions and NH 3 ligands or nitro groups. In addition, [Co(NH 3 ) 6 (N 5 ) 3 ] (1) and [Co(NH 3 ) 5 (NO 2 )](N 5 ) 2 (2) exhibited relatively high nitrogen contents of 79.2 % and 67.9 %, respectively, and the impact sensitivities of 1 (IS = 5 J) and 2 (IS = 4 J) are comparable to that of lead azide.

In order to exploit novel light−driven molecular switches, A series of pyrazolyazoindole photoswitches were designed and synthesized by modifying the nitrogen atoms of indole, three typical title compounds were characterized...

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