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High Ethene/Ethane Selectivity in 2,2′-Bipyridine-Based Silver(I) Complexes by Removal of Coordinated Solvent
Ist Teil von
Angewandte Chemie (International ed.), 2015-05, Vol.54 (19), p.5740-5743
Auflage
International ed. in English
Ort / Verlag
Weinheim: WILEY-VCH Verlag
Erscheinungsjahr
2015
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Following removal of coordinated CH3CN, the resulting complexes [AgI(2,2′‐bipyridine)][BF4] (1) and [AgI(6,6′‐dimethyl‐2,2′‐bipyridine)][OTf] (2) show ethene/ethane sorption selectivities of 390 and 340, respectively, and corresponding ethene sorption capacities of 2.38 and 2.18 mmol g−1 when tested at an applied gas pressure of 90 kPa and a temperature of (20±1) °C. These ethene/ethane selectivities are 13 times higher than those reported for known solid sorbents for ethene/ethane separation. For 2, ethene sorption reached 90 % of equilibrium capacity within 15 minutes, and this equilibrium capacity was maintained over the three sorption/desorption cycles tested. The rates of ethene sorption were also measured. To our knowledge, these are the first complexes, designed for olefin/paraffin separations, which have open silver(I) sites. The high selectivities arise from these open silver(I) sites and the relatively low molecular surface areas of the complexes.
Site unseen: The coordination complexes 1 and 2, having open silver(I) sites, were prepared and investigated for ethene/ethane binding. These complexes display ethene/ethane selectivity of up to 13 times higher than comparable solid sorbents, ethene loadings of up to 2.38 mmol g−1, and saturation of silver(I) sites of up to 0.96 molethene/molsilver(I). Tf=trifluoromethanesulfonyl.