Single-crystal-to-single-crystal transformation and proton conductivity of three hydrogen-bonded organic frameworks

We report the cyclic single-crystal-to-single-crystal transformation of three hydrogen-bonded organic frameworks (HOFs), induced by the change of temperature and humidity, which clearly reveals that the -SO 3 − and -NH 2 groups in UPC-H7 and UPC-H8 facilitate the diffusion of water molecules into their anhydrous structures to form hydrous UPC-H9. Their proton conductivity was studied under different humidity at varying temperature, showing that the proton conductivity is closely related to water molecules entering the crystal structures arising from the hydrogen bonded reorganization in combination with the triaxial single-crystal proton conductivity tests. In this communication, we report the SCSC transformation and proton conductivity of three H-bonded organic frameworks. The results show that H-bonded systems can improve their proton conductivity by uptaking water molecules based on the adaptability.