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Encapsulating Semiconductor Quantum Dots in Supramolecular Cages Enables Ultrafast Guest-Host Electron and Vibrational Energy Transfer. | LitMetric

AI Article Synopsis

  • In supramolecular chemistry, host-guest systems help encapsulate various substances, particularly in unique nanoconfined spaces, but are mostly limited to small guests.
  • Researchers developed a water-soluble metallo-supramolecular hexagonal prism with a large hydrophobic cavity that can encapsulate quantum dots (QDs) with diameters under 5.0 nm.
  • The surrounding supramolecular cage significantly alters the QDs' photophysical properties, enhancing relaxation rates through energy transfer, which broadens the potential applications for host-guest systems.

Article Abstract

In the field of supramolecular chemistry, host-guest systems have been extensively explored to encapsulate a wide range of substrates, owing to emerging functionalities in nanoconfined space that cannot be achieved in dilute solutions. However, host-guest chemistry is still limited to encapsulation of small guests. Herein, we construct a water-soluble metallo-supramolecular hexagonal prism with a large hydrophobic cavity by anchoring multiple polyethylene glycol chains onto the building blocks. Then, assembled prisms are able to encapsulate quantum dots (QDs) with diameters of less than 5.0 nm. Furthermore, we find that the supramolecular cage around each QD strongly modifies the photophysics of the QD by universally increasing the rates of QD relaxation processes via ultrafast electron and vibrational energy transfer. Taken together, these efforts expand the scope of substrates in host-guest systems and provide a new approach to tune the optical properties of QDs.

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Source
http://dx.doi.org/10.1021/jacs.2c11981DOI Listing

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