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Sustainable, non\u2010distillation methods are highly desired as alternatives. We discovered that the fluorinated bis(pyrazolyl)borate ligand supported copper(I) complex {[(CF\n 3<\/jats:sub>\n )\n 2<\/jats:sub>\n Bp]Cu}\n 3<\/jats:sub>\n has features very desirable in an olefin\u2013paraffin separation material. It binds ethylene exclusively over ethane generating [(CF\n 3<\/jats:sub>\n )\n 2<\/jats:sub>\n Bp]Cu(C\n 2<\/jats:sub>\n H\n 4<\/jats:sub>\n ). This molecular compound exhibits extremely high and record ideal adsorbed solution theory (IAST) C\n 2<\/jats:sub>\n H\n 4<\/jats:sub>\n \/C\n 2<\/jats:sub>\n H\n 6<\/jats:sub>\n gas separation selectivity, affording high purity (>99.5\u2009%) ethylene that can be readily desorbed from separation columns. In\u2010situ PXRD provides a \u201clive\u201d picture of the reversible conversion between [(CF\n 3<\/jats:sub>\n )\n 2<\/jats:sub>\n Bp]Cu(C\n 2<\/jats:sub>\n H\n 4<\/jats:sub>\n ) and the ethylene\u2010free sorbent in the solid\u2010state, driven by the presence or removal of C\n 2<\/jats:sub>\n H\n 4<\/jats:sub>\n . Molecular structures of trinuclear {[(CF\n 3<\/jats:sub>\n )\n 2<\/jats:sub>\n Bp]Cu}\n 3<\/jats:sub>\n and mononuclear [(CF\n 3<\/jats:sub>\n )\n 2<\/jats:sub>\n Bp]Cu(C\n 2<\/jats:sub>\n H\n 4<\/jats:sub>\n ) are also presented.\n <\/jats:p>","DOI":"10.1002\/anie.202109338","type":"journal-article","created":{"date-parts":[[2021,10,20]],"date-time":"2021-10-20T19:02:31Z","timestamp":1634756551000},"page":"27184-27188","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":30,"title":["A Molecular Compound for Highly Selective Purification of Ethylene"],"prefix":"10.1002","volume":"60","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6334-8421","authenticated-orcid":false,"given":"Anurag","family":"Noonikara\u2010Poyil","sequence":"first","affiliation":[{"name":"Department of Chemistry and Biochemistry The University of Texas at Arlington Arlington TX 76019 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hui","family":"Cui","sequence":"additional","affiliation":[{"name":"Department of Chemistry University of Texas at San Antonio San Antonio TX 78249 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrey A.","family":"Yakovenko","sequence":"additional","affiliation":[{"name":"X-Ray Science Division Advanced Photon Source Argonne National Laboratory Argonne IL 60439 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter W.","family":"Stephens","sequence":"additional","affiliation":[{"name":"Department of Physics and Astronomy Stony Brook University Stony Brook NY 11794-3800 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rui\u2010Biao","family":"Lin","sequence":"additional","affiliation":[{"name":"MOE Key Laboratory of Bioinorganic and Synthetic Chemistry School of Chemistry Sun Yat-Sen University Guangzhou 510275 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bin","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Chemistry University of Texas at San Antonio San Antonio TX 78249 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8707-8115","authenticated-orcid":false,"given":"Banglin","family":"Chen","sequence":"additional","affiliation":[{"name":"Department of Chemistry University of Texas at San Antonio San Antonio TX 78249 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2362-1331","authenticated-orcid":false,"given":"H. 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