A Proton Conductive Porous Framework of an 18-Crown-6-Ether Derivative Networked by Rigid Hydrogen Bonding Modules

摘要

A rigid hydrogen-bonded organic framework (HOF) was constructed from a C3-symmetric hexatopic carboxylic acid with a hydrophilic 18-crown-6-ether (18C6) component. Despite the flexible macrocyclic structure with many conformations, the derivative with three 4,4'-dicarboxy-o-terphenyl moieties in the periphery yielded a rigid layered porous framework through directional intermolecular hydrogen bonding. Interestingly, the HOF possesses ID channels with bottleneck composed of 18C6 rings. The HOF shows proton conductivity (1.12 ×10~(-7) S cm~(-1)) through Grotthuss mechanism (Ea = 0.27eV) under 98%RH. The present unique water channel structure provides an inspiration to create molecular porous materials.