High ethene/ethane selectivity in 2,2'-bipyridine-based silver(i) complexes by removal of coordinated solvent

Angewandte Chemie
Matthew G CowanRichard D Noble

Abstract

Following removal of coordinated CH3 CN, the resulting complexes [Ag(I) (2,2'-bipyridine)][BF4 ] (1) and [Ag(I) (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.

References

Aug 9, 2008·Angewandte Chemie·Mircea Dincă, Jeffrey R Long
Nov 5, 2010·Physical Chemistry Chemical Physics : PCCP·Friederike AgelPeter Wasserscheid
Sep 6, 2012·Journal of the American Chemical Society·Nour NijemYves J Chabal

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Citations

Aug 30, 2017·Chemistry : a European Journal·Giorgio Baggi, Stephen J Loeb
Feb 23, 2021·Chemical Society Reviews·Zhigang HuDan Zhao
Jun 24, 2021·Chemical Communications : Chem Comm·Ahmed H ElashkarMatthew G Cowan
Oct 21, 2021·Angewandte Chemie·Anurag Noonikara-PoyilH V Rasika Dias

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