A Reversible Crystallinity-Preserving Phase Transition in Metal鈥揙rganic Frameworks: Discovery, Mechanistic Studies, and Potential Applications

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• 作者：Dahuan Liu ; Tian-Fu Liu ; Ying-Pin Chen ; Lanfang Zou ; Dawei Feng ; Kecheng Wang ; Qiang Zhang ; Shuai Yuan ; Chongli Zhong ; Hong-Cai Zhou
• 刊名：Journal of the American Chemical Society
• 出版年：2015
• 出版时间：June 24, 2015
• 年：2015
• 卷：137
• 期：24
• 页码：7740-7746
• 全文大小：523K
• ISSN：1520-5126

文摘

A quenching-triggered reversible single-crystal-to-single-crystal (SC-SC) phase transition was discovered in a metal鈥搊rganic framework (MOF) PCN-526. During the phase transition, the one-dimensional channel of PCN-526 distorts from square to rectangular in shape while maintaining single crystallinity. Although SC-SC transformations have been frequently observed in MOFs, most reports have focused on describing the resulting structural alterations without shedding light on the mechanism for the transformation. Interestingly, modifying the occupancy or species of metal ions in the extra-framework sites, which provides mechanistic insight into the causes for the transformation, can forbid this phase transition. Moreover, as a host scaffold, PCN-526 presents a platform for modulation of the photoluminescence properties by encapsulation of luminescent guest molecules. Through judicious choice of these guest molecules, responsive luminescence caused by SC-SC transformations can be detected, introducing a new strategy for the design of novel luminescent MOF materials.