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High Ethene/Ethane Selectivity in 2,2′‐Bipyridine‐Based Silver(I) Complexes by Removal of Coordinated Solvent
Author(s) -
Cowan Matthew G.,
McDanel William M.,
Funke Hans H.,
Kohno Yuki,
Gin Douglas L.,
Noble Richard D.
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201500251
Subject(s) - sorption , chemistry , selectivity , desorption , olefin fiber , solvent , hydrocarbon , bipyridine , inorganic chemistry , organic chemistry , catalysis , adsorption , crystal structure
Following removal of coordinated CH 3 CN, the resulting complexes [Ag I (2,2′‐bipyridine)][BF 4 ] ( 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.