Two new metal-organic framework complexes Cu-MOF (CHCuNOS) and Fe-MOF (CHFeNOS) were synthesized with 4-[5-(pyridin-4-yl)-[1,3]thiazolo[5,4-] [1,3]thiazol-2-yl]pyridine (Py2TTz) and pyridine-2,6-dicarboxylic acid (DPA) as mixed ligands. The single crystal X-ray diffraction results displayed that Cu coordinated with Py2TTz and DPA to form 3D network structure while Fe coordinated only with DPA to form 2D laminar structure, in which Py2TTz interspersed between bilayer iron complexes. The presence of Py2TTz enlarged the pore size of Fe-MOF, increasing its Brunauer-Emmett-Teller (BET) surface area and specific surface area, while the 3D structure of Cu-MOF facilitated electron transport and mass transfer. As a result, the hydrogen evolution reaction (HER) performance of Cu-MOF was slightly higher than that of Fe-MOF. This work provided an interesting idea for the design and synthesis of inexpensive HER electrocatalysts.

中文翻译：

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基于混合配体的Cu/Fe-MOFs：合成、晶体结构和电催化析氢性能

以 4-[5-(pyridin-4-yl)-[1,3]thiazolo[5,4-] [1] 为原料合成了两种新型金属有机骨架配合物 Cu-MOF (CHCuNOS) 和 Fe-MOF (CHFeNOS)。 ,3]噻唑-2-基]吡啶 (Py2TTz) 和吡啶-2,6-二甲酸 (DPA) 作为混合配体。单晶X射线衍射结果表明，Cu与Py2TTz和DPA配位形成3D网络结构，而Fe仅与DPA配位形成2D层状结构，其中Py2TTz散布在双层铁配合物之间。 Py2TTz 的存在扩大了 Fe-MOF 的孔径，增加了其 Brunauer-Emmett-Teller (BET) 表面积和比表面积，而 Cu-MOF 的 3D 结构有利于电子传输和质量传递。结果，Cu-MOF的析氢反应（HER）性能略高于Fe-MOF。这项工作为廉价的 HER 电催化剂的设计和合成提供了一个有趣的想法。