A Proton Conductive Porous Framework of an 18‐Crown‐6‐Ether Derivative Networked by Rigid Hydrogen Bonding Modules
Xin Chen, Rui‐Kang Huang, Kiyonori Takahashi, Shin‐ichiro Noro, Takayoshi Nakamura, Ichiro Hisaki
Abstract
Abstract A rigid hydrogen‐bonded organic framework (HOF) was constructed from a C 3 ‐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 1D channels with bottleneck composed of 18C6 rings. The HOF shows proton conductivity (1.12×10 −7 S cm −1 ) through Grotthuss mechanism ( E a =0.27 eV) under 98 %RH. The present unique water channel structure provides an inspiration to create molecular porous materials.