title: Reversible structural change of Cu-MOF on exposure to water and its CO2 adsorptivity.
abstract: It is important to study the interaction between water molecules and a host structure for understanding the adsorption mechanism of metal-organic framework (MOF) materials. The evolution of the structure of a flexible Cu-MOF, {[Cu(bpy)(H2O)2(BF4)2](bpy)} (bpy=4,4'-bipyridine), upon dehydration and rehydration was studied by thermogravimetric analysis (TGA), infrared (IR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), and water adsorption. A nearly reversible structural change was observed upon rehydration. More importantly, a unique CO2 "gate adsorption" phenomenon was observed despite the exposure of the Cu-MOF to water. This shows that the Cu-MOF has relatively good stability after exposure to water.
authors.affiliation: Graduate School of Science, Chiba University, 1-33 Yayoi, Inage, Chiba 263-8522, Japan.
authors.forename: Yan
authors.initials: Y
authors.lastname: Cheng
authors.forename: Atsushi
authors.initials: A
authors.lastname: Kondo
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Noguchi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kajiro
authors.forename: Koki
authors.initials: K
authors.lastname: Urita
authors.forename: Tomonori
authors.initials: T
authors.lastname: Ohba
authors.forename: Katsumi
authors.initials: K
authors.lastname: Kaneko
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Kanoh