Dual-cubic-cage based lanthanide sulfate–carboxylpyrazolate frameworks with high hydrolytic stability and remarkable proton conduction

We report herein a series of lanthanide sulfate–carboxylpyrazolate frameworks based on double cuboid cavities that are highly hot-water stable, and have room-temperature proton conductivity of over 10−3 S cm−1 at 97% relative humidity without any appreciable loss of performance for at least three recycling times, ranking among the best lanthanide-based coordination frameworks.