Abstract
Stimuli‐responsive structural transformations are emerging as a scaffold to develop a charming class of smart materials. A EuL 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 Eu3+ in the channels at low and room temperatures. At room temperature, compound 1a 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. In 1b, 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. Utilizing EuL 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.
Highlights
Stimuli-responsive structural transformations are emerging as a scaffold to example, single-crystal devices generally develop a charming class of smart materials
The use of dynamic covalent chemistry to program a fundamental response has been a new trend in designing adaptive materials. This could be a strategic approach to harvesting metal-organic framework (MOF)-based smart materials, which require dynamic control between their noncovalent and covalent interactions
Structures of Two Compounds at 193 K, and found that the space group of EuL transformed from C2/c to P21/n, making a new EuL MOF (1b), with no X-ray analysis at 293 K reveals EuL MOF (1a) crystallizes in the apparent difference between 1a and 1b in color, shape, and monoclinic space group C2/c
Summary
The term “dynamic bond” can be defined as a class of bond that can selectively undergo reversible breaking and reformation upon exposure to certain environmental factors.[10] Reversible or dynamic covalent chemistry involving such “dynamic bond” has a long history in polymer science, and a wide range of stimuli-responsive materials with many different mechanisms to “read” and respond to the input stimulus have been exploited.[11] The use of dynamic covalent chemistry to program a fundamental response has been a new trend in designing adaptive materials This could be a strategic approach to harvesting MOF-based smart materials, which require dynamic control between their noncovalent and covalent interactions. The distances between two adjacent uncoordinated carboxyl groups are 4.825(7) and 4.878(3) Å
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