title: Trapping of a spatial transient state during the framework transformation of a porous coordination polymer.
abstract: Structural transformability accompanied by molecular accommodation is a distinguished feature of porous coordination polymers (PCPs) among porous materials. Conventional X-ray crystallography allows for the determination of each structural phase emerged during transformation. However, the propagation mechanism of transformation through an entire crystal still remains in question. Here we elucidate the structural nature of the spatial transient state, in which two different but correlated framework structures, an original phase and a deformed phase, simultaneously exist in one crystal. The deformed phase is distinctively generated only at the crystal surface region by introducing large guest molecules, while the remaining part of crystal containing small molecules maintains the original phase. By means of grazing incidence diffraction techniques we determine that the framework is sheared with sharing one edge of the original primitive cubic structure, leading to the formation of crystal domains with four mirror image relationships.
authors.affiliation: Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501, Japan.
authors.forename: Mio
authors.initials: M
authors.lastname: Kondo
authors.forename: Shuhei
authors.initials: S
authors.lastname: Furukawa
authors.forename: Kenji
authors.initials: K
authors.lastname: Hirai
authors.forename: Takaaki
authors.initials: T
authors.lastname: Tsuruoka
authors.forename: Julien
authors.initials: J
authors.lastname: Reboul
authors.forename: Hiromitsu
authors.initials: H
authors.lastname: Uehara
authors.forename: Stéphane
authors.initials: S
authors.lastname: Diring
authors.forename: Yoko
authors.initials: Y
authors.lastname: Sakata
authors.forename: Osami
authors.initials: O
authors.lastname: Sakata
authors.forename: Susumu
authors.initials: S
authors.lastname: Kitagawa
mesh_terms: D056831:Coordination Complexes / Q000737:chemistry*; D018360:Crystallography, X-Ray; D008958:Models, Molecular; D044367:Phase Transition; D011108:Polymers / Q000737:chemistry*; D016062:Porosity; D015032:Zinc / Q000737:chemistry*
chemical_list: D056831:Coordination Complexes; D011108:Polymers; D015032:Zinc