Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 17, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202202073
Keywords
Flexible Metal-Organic Frameworks; Multi-Stimuli-Chromism; Smart Luminescent Materials
Categories
Funding
- National Natural Science Foundation of China [22171144, 21771113, 21725304, 22001132]
- China Postdoctoral Science Foundation [2019M651011]
- Fundamental Research Funds for the Central Universities, Nankai University [023-63213068, 023-63213100]
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Developing universal stimuli-responsive materials capable of emitting a broad spectrum of colors is highly desirable. In this study, a conformation-adaptable organic chromophore was deliberately grafted into a flexible metal-organic framework, resulting in color tunability over the visible range. The material displayed thermo-, piezo-, and solvato-fluoro-chromism, all behaving in a sensitive and self-reversible manner.
Developing universal stimuli-responsive materials capable of emitting a broad spectrum of colors is highly desirable. Herein, we deliberately grafted a conformation-adaptable organic chromophore into the established coordination space of a flexible metal-organic framework (MOF). In terms of the coupled structural transformations and the space confinement, the chromophore in the MOF matrix underwent well-regulated conformational changes under physical and chemical stimuli, simultaneously displaying thermo-, piezo-, and solvato-fluoro-chromism with color tunability over the visible range. Owing to the resilient nature and the reduced dimensionality of the selected coordination space, all three color modulations behaved in a sensitive and self-reversible manner, each following a linear correlation of the emission maximum with stimulus. Single-crystal X-ray diffraction of the variable-temperature structures and solvent-inclusion crystals elucidated the intricate color varying mechanisms.
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