title: Spontaneous and selective CO2 sorption under ambient conditions in seemingly nonporous molecular crystal of azacalix[5]arene pentamethyl ether.
abstract: Described are the syntheses, crystal structures, and solid-gas adsorption behaviors of azacalix[4]arene tetramethyl ether and azacalix[5]arene pentamethyl ether. While the former compound exhibited no adsorption of four main atmospheric components, the latter selectively and rapidly adsorbed CO(2) at ambient temperature and pressure. X-ray crystallographic and potential energy distribution analysis revealed that azacalix[5]arene created an energetically favorable space for CO(2) in its seemingly nonporous crystal, leading to the observed selective CO(2) uptake under ambient conditions.
authors.affiliation: Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-nihonmatsu, Sakyo-ku, Kyoto 606-8501, Japan. tsue@ger.mbox.media.kyoto-u.ac.jp
authors.forename: Hirohito
authors.initials: H
authors.lastname: Tsue
authors.forename: Kohei
authors.initials: K
authors.lastname: Ono
authors.forename: Satoshi
authors.initials: S
authors.lastname: Tokita
authors.forename: Koichi
authors.initials: K
authors.lastname: Ishibashi
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Matsui
authors.forename: Hiroki
authors.initials: H
authors.lastname: Takahashi
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Miyata
authors.forename: Daisuke
authors.initials: D
authors.lastname: Takahashi
authors.forename: Rui
authors.initials: R
authors.lastname: Tamura