Abstract
The design of new crystalline porous proton-conducing materials becomes an urgent demand because of the increasing demand of energy. Metal–organic frameworks (MOFs), or porous coordination polymers (PCPs), have been proved to be ideal candidates for proton-conducting materials in recent years due to their tailorable structures, good crystallinity, and functionalizable porosity. In order to search for new crystalline porous proton-conducing material with high proton conductivity, a new BaII coordination polymer based on a simple ligand p-phthalic acid, namely, [Ba(p-BDC)]n (1) [p-H2BDC = 1,4-benzenedicarboxylic acid], has been successfully synthesized under solvothermal conditions and structurally characterized. 1 exhibits a three-dimensional framework with a pillared–layered structure. 1 was found to be stable in aqueous solution with pH values ranging from 1 to 11 as well as in (boiling) water. 1 shows a high proton conductivity value of 2.5 × 10−4 S·cm−1 at 98% RH and 100 °C. In addition, through structural analysis and calculated Ea values, the proton conducting mechanism was highlighted.
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