Effect of Azole Counterions on Thermal and Transport Properties of the Hydrated Salts of Hemimelitic Acid

We reported a novel hydrated solid-state proton conductor's structure, charge transport, and spectroscopic properties. The resulting material of the hydrated imidazolium (ImiHemH(2)O) and pyrazolium (PyrHemH(2)O) hemimelitate is a solid-state hydrate with one water molecule per structural unit. The ions in the crystal structure are connected by N+-HO- hydrogen bonds and the anions are connected to the water molecules by O-HO hydrogen bonds. The strength of the intermolecular hydrogen bonds is important for the thermal and conductive properties of the studied hemimelitic acid salts. The chain motif of the N+-HO- hydrogen bonds influences the greater thermal stability of the salt. The weaker strength of the O-HO hydrogen bonds leads to better conductive properties of the salt.