title: Selective removal of alkynes from diene mixtures using ether-functionalized Cu(i)-containing ionic liquids as extractants.
abstract: Cu(i)-Containing room temperature ionic liquids (Cu-EnA), prepared from CuCl and ether-functionalized ionic liquids (ILs) bearing a methanesulfonate anion (EnA, n = 1, 2 or 3), were thermally stable and highly effective for the removal of alkynes such as isopropenylacetylene (IPA) and 2-butyne (2-BT) contained in dienes like isoprene (2-methyl-1,3-butadiene). Cu-EnA were found to reversibly and selectively interact with IPA and 2-BT, thereby enabling the regeneration of Cu-EnA. Fast atom bombardment (FAB)-mass spectral and computational results imply that EnA consists of an ether-functionalized imidazolium cation and a methanesulfonate-coordinated Cu(i) anion such as [CuCl(CH3SO3)]-([CuClA]-) or [Cu(CH3SO3)2]-([CuA2]-). Computational studies demonstrate that the preferential extraction of IPA and 2-BT to isoprene by Cu-EnA originated from the difference in the strength of the hydrogen bonding and π-complexation.
authors.affiliation: Department of Chemistry, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea. khs2004@khu.ac.kr mcheong@khu.ac.kr.
authors.forename: Young Jin
authors.initials: YJ
authors.lastname: Kim
authors.affiliation: Department of Chemistry, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea. khs2004@khu.ac.kr mcheong@khu.ac.kr.
authors.forename: Hyun Ji
authors.initials: HJ
authors.lastname: Lee
authors.affiliation: Department of Chemistry, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea. khs2004@khu.ac.kr mcheong@khu.ac.kr.
authors.forename: Yohan
authors.initials: Y
authors.lastname: Ahn
authors.affiliation: Department of Chemistry, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea. khs2004@khu.ac.kr mcheong@khu.ac.kr.
authors.forename: Shuyao
authors.initials: S
authors.lastname: Zhang
authors.affiliation: Department of Chemistry, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea. khs2004@khu.ac.kr mcheong@khu.ac.kr.
authors.forename: Je Seung
authors.initials: JS
authors.lastname: Lee
authors.affiliation: Department of Chemistry, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea. khs2004@khu.ac.kr mcheong@khu.ac.kr.
authors.forename: Minserk
authors.initials: M
authors.lastname: Cheong
authors.affiliation: Department of Chemistry, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea. khs2004@khu.ac.kr mcheong@khu.ac.kr.
authors.forename: Hoon Sik
authors.initials: HS
authors.lastname: Kim