We report the design and synthesis of a titanium catecholate framework, MOF-217, comprised of 2,4,6-tri(3,4-dihydroxyphenyl)-1,3,5-triazine (TDHT) and isolated TiO₆ clusters, with 2-fold interpenetrated srs topology. The dynamics of the organic linker, breaking the C_3h symmetry, allowed for reversible twist and sliding between interpenetrated frames upon temperature change and the inclusion of small molecules. Introduction of 28 wt% imidazole into the pores of MOF-217, 28% Im-in-MOF-217, resulted in four orders of magnitude increase in proton conductivity, due to the appropriate accommodation of imidazole molecules and their proton transfer facilitated by the H-bond to the MOF structure across the pores. This MOF-based proton conductor can be operated at 100 °C with a proton conductivity of 1.1 × 10⁻³ S cm⁻¹, standing among the best performing anhydrous MOF proton conductors at elevated temperature. The interframe dynamics represents a unique feature of MOFs that can be accessed in the future design of proton conductors.

中文翻译：

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Ti-MOF 中互穿框架之间的扭转和滑动动力学揭示了高质子传导性

我们报道了儿茶酚钛骨架 MOF-217 的设计和合成，该骨架由 2,4,6-三(3,4-二羟基苯基)-1,3,5-三嗪 (TDHT) 和分离的 TiO 6 簇组成_，其中2 重互穿srs拓扑。有机连接体的动力学打破了C _3h对称性，允许在温度变化和包含小分子时在互穿框架之间进行可逆扭曲和滑动。将 28 wt% 咪唑引入 MOF-217（28% Im-in-MOF-217）的孔中，由于咪唑分子的适当调节及其质子转移的促进，质子电导率增加了四个数量级。氢键与穿过孔的 MOF 结构结合。这种基于MOF的质子导体可以在100 °C下工作，质子电导率为1.1 × 10 ^-3 S cm ^-1，是高温下性能最好的无水MOF质子导体之一。框架间动力学代表了 MOF 的独特特征，可以在未来的质子导体设计中使用。