Abstract
We report enhanced proton conductivity promoted by a structural phase transition of MFM-504(Cu)-DMF to MFM-504(Cu)-MeOH and to MFM-504(Cu)-OH via ligand substitution upon exposure to MeOH and H2O vapors, respectively. MFM-504(Cu)-DMF can be synthesized by the solvothermal reaction of Cu(NO3)2·3H2O and the flexible zwitterionic ligand, imidazolium-1,3-bis(methylenedicarboxylate) (imidc-), to afford a unique layered interwoven network structure. MFM-504(Cu)-OH shows a proton conductivity of 5.01 × 10-4 S cm-1 at 80 °C and 99% relative humidity (RH) with an activation energy (E a) of 0.80 eV, indicating a vehicle mechanism within MFM-504(Cu)-OH.
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