The synthesis and characterization of two novel pillared coordination cages is reported. By utilizing 1,4-diazabicyclo[2.2.2]octane (dabco) as a pillar with increased basicity as compared to pyrazine or 4,4′-bipyridine, a stable copper-based material was prepared. Extending this strategy to iron(II) afforded an isostructural material that similarly retains high porosity and crystallinity upon solvent evacuation. Importantly, the iron solid represents a rare example of porous iron paddlewheel-based metal–organic material that is stable to solvent evacuation. Neutron powder diffraction studies on these materials indicate the triangular and square windows of the cage are prime ethane and ethylene adsorption sites.

中文翻译：

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柱状配位笼的同构系列中的气体吸附†

报道了两种新型柱状配位笼的合成和表征。通过利用 1,4-二氮杂双环 [2.2.2] 辛烷 (dabco) 作为与吡嗪或 4,4'-联吡啶相比碱度更高的支柱，制备了稳定的铜基材料。将此策略扩展到铁 ( II ) 提供了一种同构材料，该材料在溶剂抽空时同样保持高孔隙率和结晶度。重要的是，铁固体代表了多孔铁叶轮基金属有机材料的一个罕见例子，该材料对溶剂排出稳定。对这些材料的中子粉末衍射研究表明笼子的三角形和方形窗口是主要的乙烷和乙烯吸附位点。