Crystalline, electrically conductive, and intrinsically porous materials are rare. Layered two-dimensional (2D) metal-organic frameworks (MOFs) break this trend. They are porous crystals that exhibit high electrical conductivity and are novel platforms for studying fundamentals of electricity and magnetism in two dimensions. Despite demonstrated applications, electrical transport in these remains poorly understood because of a lack of single crystal studies. Here, studies of single crystals of two 2D MOFs, Ni3(HITP)2 and Cu3(HHTP)2, uncover critical insights into their structure and transport. Conductivity measurements down to 0.3 K suggest metallicity for mesoscopic single crystals of Ni3(HITP)2, which contrasts with apparent activated conductivity for polycrystalline films. Microscopy studies further reveal that these MOFs are not isostructural as previously reported. Notably, single rods exhibit conductivities up to 150 S/cm, which persist even after prolonged exposure to ambient conditions. These single crystal studies confirm that 2D MOFs hold promise as molecularly tunable platforms for fundamental science and applications where porosity and conductivity are critical.

中文翻译：

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导电二维金属有机骨架的单晶：结构和电传输特性。

晶体，导电和本征多孔材料很少见。分层的二维（2D）金属有机框架（MOF）打破了这种趋势。它们是具有高电导率的多孔晶体，是研究二维电学和磁学基础的新颖平台。尽管已证明有应用，但由于缺乏单晶研究，仍不清楚这些物质中的电传输。在这里，对两个二维MOF Ni3（HITP）2和Cu3（HHTP）2的单晶的研究揭示了对其结构和传输的重要见解。低至0.3 K的电导率测量表明Ni3（HITP）2的介观单晶具有金属性，这与多晶膜的表观活化电导率形成对比。显微镜研究进一步揭示，这些MOF不是以前报道的同构。值得注意的是，单根棒材的电导率高达150 S / cm，即使长时间暴露在环境条件下也能保持导电性。这些单晶研究证实，二维MOF具有广阔的前景，可作为孔隙度和电导率至关重要的基础科学和应用的分子可调平台。