A novel family of microporous boron cage pillared supramolecular metal–organic frameworks BSF-n (n = 4–8) were synthesized with the self-assembly behavior controlled by solvents. Their porous structures of formula [CuB₁₂H₁₂(L)₂]_n (L = 4,4′-azopyridine for BSF-4 and BSF-5; L = 1,2-bis(4-pyridyl)acetylene for BSF-6; L = 1,4-di(pyridine-4-yl)benzene for BSF-7; L = 4,4′-dipyridine for BSF-8) were all characterised by single crystal diffraction analysis. The use of ethylene glycol leads to non-interpenetrated structures while methanol/water solution affords interpenetrated frameworks. Gas adsorption experiments indicated that interpenetrated BSF-4 has the potential for highly selective separation of C₂H₂/C₂H₄ and C₂H₂/CO₂ mixtures.

中文翻译：

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溶剂依赖性的硼笼柱金属有机骨架的超分子自组装，用于选择性气体分离

合成了一种新型的微孔硼笼状柱状超分子金属-有机骨架BSF- n（n = 4-8），其自组装行为受溶剂控制。式[CuB ₁₂ H ₁₂（L）₂ ] _n的多孔结构（对于BSF-4和BSF-5，L = 4,4'-偶氮吡啶；对于BSF-6，L = 1,2-双（4-吡啶基）乙炔； L = 1,4-二（吡啶-4-基）通过单晶衍射分析来表征BSF-7的苯； BSF-8的L ＝ 4,4'-二吡啶。乙二醇的使用导致非互穿结构，而甲醇/水溶液提供互穿的骨架。气体吸附实验表明，互穿的BSF-4具有高度选择性分离C ₂ H ₂ / C ₂ H ₄和C ₂ H ₂ / CO ₂混合物的潜力。