Visible-Light-Driven Rotation of Molecular Motors in a Dual-Function Metal–Organic Framework Enabled by Energy Transfer

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Abstract
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 post synthetic solvent assisted linker exchange (SALE) method and the structure of the material was confirmed by powder (PXRD) and single crystal X-ray (SCXRD) 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 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.
Funding Information
  • Ministero dell’Istruzione, dell’Università e della Ricerca (20173L7W8K)
  • Ministerie van Onderwijs, Cultuur en Wetenschap (024.001.035)
  • Alexander von Humboldt-Stiftung
  • H2020 European Research Council (694345)
  • Netherlands Organization for Scientific Research

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