A polyhedral metal–organic framework (MOF) JLU-Liu40-In based on dual secondary building units (SBUs) of mononuclear and binuclear paddlewheel indium has been prepared with a nitrogen-rich tetracarboxylic acid ligand under solvothermal conditions. Since the framework possesses large surface areas with multiple polyhedral cages, abundant open metal sites (OMSs) and Lewis basic sites (LBSs), it exhibits high performance for gas adsorption. In addition, through post-synthetic metal-ion metathesis in a single-crystal-to-single-crystal (SCSC) process, JLU-Liu40-In/Cu has been obtained by selectively substituting the paddlewheel In(III) ions with Cu(II) ions without replacing the mononuclear In(III). The framework remains in the form of a single crystal throughout the process. It is worth noting that the metal-ion metathesis approach constructs JLU-Liu40-In/Cu with a significant improvement in thermal stability and gas sorption and separation.

中文翻译：

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单晶到单晶过程中的合成后金属离子复分解：提高铟基金属-有机骨架的气体吸附和分离能力

基于溶剂热条件下的富氮四羧酸配体，制备了基于单核和双核桨轮铟的双重二级结构单元（SBU）的多面体金属-有机骨架（MOF）JLU-Liu40-In。由于框架具有较大的表面积，具有多个多面体的笼子，丰富的裸露金属位点（OMS）和路易斯碱性位点（LBS），因此具有高性能的气体吸附性能。此外，通过在单晶至单晶（SCSC）过程中进行合成后金属离子复分解，通过用Cu（）选择性地替换了桨轮In（III）离子，获得了JLU-Liu40-In / Cu。II）离子而不替换单核In（III））。在整个过程中，框架保持为单晶形式。值得注意的是，金属离子复分解方法构建的JLU-Liu40-In / Cu具有热稳定性以及气体吸附和分离的显着改善。