A proton-conducting cesium sulfonate metal organic framework

We report a cesium sulfonate metal organic framework (Cs3(L)(H2O)3.3, 1, L = 1,3,5-trisulfonato-2,4,6-trihydroxybenzene) with hydrated channels that conduct protons at 1.1 × 10−5 S cm−1 at 50% relative humidity and 70 °C. Water was crystallographically observed in the structure, and the likely proton-transfer pathway was studied. The material was not robust, and appropriate parameters were employed to ensure meaningful data were extracted from the study.