A Temperature‐Responsive Smart Europium Metal‐Organic Framework Switch for Reversible Capture and Release of Intrinsic Eu3+ Ions. Issue 4 (10th March 2015)

• Record Type: Journal Article
• Authors: Zhu, Min; Song, Xue‐Zhi; Song, Shu‐Yan; Zhao, Shu‐Na; Meng, Xing; Wu, Lan‐Lan; Wang, Cheng; Zhang, Hong‐Jie
• Is Part Of: Advanced science. Volume 2:Issue 4(2015:Apr.)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2015-03-10
• Subjects: dynamic bonds -- explosive detection -- host‐guest system -- phase transitions -- smart frameworks; Science -- Periodicals; 505
• DOI: 10.1002/advs.201500012
• Languages: English
• ISSNs: 2198-3844

Abstract

Abstract : Stimuli‐responsive structural transformations are emerging as a scaffold to develop a charming class of smart materials. AEuL metal‐organic framework (MOF) undergoes a reversible temperature‐stimulated single‐crystal to single‐crystal transformation, showing a specific behavior of fast capture/release of free Eu 3+ in the channels at low and room temperatures. At room temperature, compound1a is obtained with one free carboxylate group severing as further hook, featuring one‐dimensional square channels filled with intrinsic free europium ions. Trigged by lowering the ambient temperature, 1b is gained. In1b, the intrinsic free europium ions can be fast captured by the carboxylate‐hooks anchored in the framework, resulting in the structural change and its channel distortion. To the best of our knowledge, this is the first report of such a rapid and reversible switch stemming from dynamic control between noncovalent and covalent Eu–ligand interactions. UtilizingEuL MOF to detect highly explosive 2, 4, 6‐trinitrophenol at room temperature and low temperature provides a glimpse into the potential of this material in fluorescence sensors. Abstract : A new EuL MOF undergoes a reversible single‐crystal to single‐crystal transformation, featuring a fast capture and release of free Eu 3+ ions in the channels at low and room temperatures. Such rapid and reversible dynamic control between noncovalent and covalent Eu‐ligand interactions has the potential to develop smart materials.