A carbazole-based linker 9-(carboxymethyl)carbazole-3,6-dicarboxylic acid (Hcbzac) was synthesized for the first time. Its structure was confirmed via H NMR and Powder X-Ray Diffraction (PXRD) methods. A novel calcium-based 2D MOF Ca(Hcbzac)(DMF) (ZIOC-10) was synthesized via a solvothermal procedure. It was found that the obtained framework undergoes several structural changes upon heating, which lead to the formation of a new framework Ca(Hcbzac) (ZIOC-10a). Noteworthy, ZIOC-10 transforms into the permanent porous (524 m/g) 3D framework, which can absorb methane, ethane, propane, and carbon dioxide at room temperature.

中文翻译：

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基于新型咔唑连接体的新型钙金属有机骨架（Ca-MOF）ZIOC-10的合成及吸附性能

首次合成了基于咔唑的连接体9-(羧甲基)咔唑-3,6-二甲酸(Hcbzac)。通过 1H NMR 和粉末 X 射线衍射 (PXRD) 方法证实了其结构。通过溶剂热法合成了一种新型钙基二维 MOF Ca(Hcbzac)(DMF) (ZIOC-10)。研究发现，所获得的骨架在加热时会发生一些结构变化，从而形成新的骨架Ca(Hcbzac) (ZIOC-10a)。值得注意的是，ZIOC-10转变为永久多孔（524 m/g）3D框架，可以在室温下吸收甲烷、乙烷、丙烷和二氧化碳。