Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.
Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, Ottignies-Louvain-la-Neuve, Belgium.
Ann N Y Acad Sci. 2022 Dec;1518(1):226-230. doi: 10.1111/nyas.14906. Epub 2022 Oct 2.
Metal-organic frameworks (MOFs) are hybrid materials known for their nanoscale pores, which give them high surface areas but generally lead to poor electrical conductivity. Recently, MOFs with high electrical conductivity were established as promising materials for a variety of applications in energy storage and catalysis. Many recent reports investigating the fundamentals of charge transport in these materials focus on the role of the organic ligands. Less consideration, however, is given to the metal ion forming the MOF, which is almost exclusively a late first-row transition metal. Here, we report a moderately conductive porous MOF based on trivalent gallium and 2,3,6,7,10,11-hexahydroxytriphenylene. Gallium, a metal that has not been featured in electrically conductive MOFs so far, has a closed-shell electronic configuration and is present in its trivalent state-in contrast to most conductive MOFs, which are formed by open-shell, divalent transition metals. Our material, made without using any harmful solvents, displays conductivities on the level of 3 mS/cm and a surface area of 196 m /g, comparable to transition metal analogs.
金属-有机骨架（MOFs）是一种混合材料，以其纳米级孔隙而闻名，这赋予了它们很高的表面积，但通常导致其导电性很差。最近，具有高导电性的 MOFs 被确立为在储能和催化等多种应用中很有前途的材料。许多最近的报告研究了这些材料中电荷输运的基本原理，重点关注有机配体的作用。然而，对于形成 MOF 的金属离子考虑较少，而该金属离子几乎完全是第一过渡金属的后过渡金属。在这里，我们报告了一种基于三价镓和 2,3,6,7,10,11-六羟基三联苯的中等导电性多孔 MOF。镓是一种迄今为止尚未在导电 MOFs 中出现的金属，具有全满的电子构型，呈三价态——与大多数由开壳层、二价过渡金属形成的导电 MOFs 形成对比。我们的材料是在不使用任何有害溶剂的情况下制成的，其电导率达到 3 mS/cm，比表面积为 196 m /g，与过渡金属类似物相当。
