An unexpected imidazole-induced porphyrinylphosphonate-based MOF-to-HOF structural transformation leading to the enhancement of proton conductivity

The modification of a novel metal–organic framework IPCE-1Pd by imidazole vapor led to an unexpected transformation into a hydrogen-bonded framework, IPCE-1Pd_Im , with high proton conductivity (up to 6.54 × 10 −3 S cm −1 at 85 °C and 95% humidity).