Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 142, Issue 19, Pages 9048-9056Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.0c03063
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Funding
- Netherlands Organization for Scientific Research (NWO CW)
- European Research Council (ERC) [694345]
- Ministry of Education, Culture and Science [024.001.035]
- MIUR grant Dipartimenti di Eccellenza-2017 Materials For Energy
- Alexander von Humboldt foundation
- PRIN [20173L7W8K]
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The visible-light-driven rotation of an overcrowded alkene-based molecular motor strut in a dual-function metal-organic framework (MOF) is reported. Two types of functional linkers, a palladium-porphyrin photosensitizer and a bispyridine-derived molecular motor, were used to construct the framework capable of harvesting low-energy green light to power the rotary motion. The molecular motor was introduced in the framework using the postsynthetic solvent-assisted linker exchange (SALE) method, and the structure of the material was confirmed by powder (PXRD) and single-crystal X-ray (SC-XRD) diffraction. The large decrease in the phosphorescence lifetime and intensity of the porphyrin in the MOFs upon introduction of the molecular motor pillars confirms efficient triplet-to-triplet energy transfer between the porphyrin linkers and the molecular motor. Near-infrared Raman spectroscopy revealed that the visible light-driven rotation of the molecular motor proceeds in the solid state at rates similar to those observed in solution.
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