Trapping of a Spatial Transient State During the Framework Transformation of a Porous Coordination Polymer

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• 作者：Mio Kondo ; Shuhei Furukawa ; Kenji Hirai ; Takaaki Tsuruoka ; Julien Reboul ; Hiromitsu Uehara ; St茅phane Diring ; Yoko Sakata ; Osami Sakata ; Susumu Kitagawa
• 刊名：Journal of the American Chemical Society
• 出版年：2014
• 出版时间：April 2, 2014
• 年：2014
• 卷：136
• 期：13
• 页码：4938-4944
• 全文大小：428K
• 年卷期：v.136,no.13(April 2, 2014)
• ISSN：1520-5126

文摘

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.