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Dinuclear Copper Sulfate-Based Square Lattice Topology Network with High Alkyne Selectivity.
Crystal Growth & Design 2024 March 21
Porous coordination networks (PCNs) sustained by inorganic anions that serve as linker ligands can offer high selectivity toward specific gases or vapors in gas mixtures. Such inorganic anions are best exemplified by electron-rich fluorinated anions, e.g., SiF6 2- , TiF6 2- , and NbOF5 2- , although sulfate anions have recently been highlighted as inexpensive and earth-friendly alternatives. Herein, we report the use of a rare copper sulfate dimer molecular building block to generate two square lattice, sql , coordination networks which can be prepared via solvent layering or slurrying, CuSO4 (1,4-bib)1.5 , 1 , (1,4-bib = 1,4-bisimidazole benzene) and CuSO4 (1,4-bin)1.5 , 2 , (1,4-bin = 1,4-bisimidazole naphthalene). Variable-temperature SCXRD and PXRD experiments revealed that both sql networks underwent reversible structural transformations due to linker rotations or internetwork displacements. Gas sorption studies conducted upon the narrow-pore phase of CuSO4 (1,4-bin)1.5 , 2np , found a high calculated 1:99 selectivity for C2 H2 over C2 H4 (33.01) and CO2 (15.18), as well as strong breakthrough performance. Across-the-board, C3 H4 selectivity vs C3 H6 , CO2 , and C3 H8 was also observed. Sulfate-based PCNs, although still understudied, appear increasingly likely to offer utility in gas and vapor separations.
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