Abstract
To design and obtain proton conductive MOFs with high stability, we used 2-(2-carboxylphenyl)-1H-imidazole-4,5-dicarboxylic acid (o-CbPhH4IDC) to react with Sr(NO3)2 under hydrothermal condition. Fortunately, a novel 1D chain MOF, {[Sr(o-CPhH2IDC)(H2O)2]·2H2O}n (1) was obtained. Its thermal, water and chemical stabilities were investigated by TGA and PXRD determinations. Impressively, variable-temperature and variable-humidity experiments for 1 indicate that its proton conductivity increases significantly with the increase of temperature or humidity. MOF 1 has optimal proton conductivity of 6.08 × 10−5 S cm−1 under 98% RH and 100 °C, which can be compared to the reported imidazole dicarboxylate-based MOFs. The results of structural analysis, Ea values and water vapor absorption were utilized to get an insight into the proton mechanism. The time-dependent tests illustrate its ability to keep conductivity up to 24 h.
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