4.8 Article

Solvent-Dependent Supramolecular Host-Guest Assemblies of Platinum(II) Tweezers and a Guest System: From Discrete Molecules to High-Ordered Oligomers

Journal

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 35, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202207313

Keywords

Host-Guest Systems; Molecular Recognition; Nanostructures

Funding

  1. UGC
  2. Collaborative Research Fund (CRF) from the Research Grants Council of Hong Kong [C7075-21G]
  3. General Research Fund (GRF) from the Research Grants Council of Hong Kong [HKU17303421]
  4. CAS-Croucher Funding Scheme for Joint Laboratory on Molecular Functional Materials for Electronics
  5. University of Hong Kong

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A series of platinum(II) calix[4]arene-based molecular tweezers were synthesized, and their host-guest association with a charge-neutral cyclometalated platinum(II) complex was studied. The experiments showed that changing the solvent composition could control the assembly process, resulting in the formation of high-ordered host-guest oligomers. The change in assembly behaviors could be detected through drastic color changes.
A series of platinum(II) calix[4]arene-based molecular tweezers was synthesized. The studies of the host-guest association with a charge-neutral cyclometalated platinum(II) complex showed a drastic color change and the turning on of near-infrared emission resulting from Pt center dot center dot center dot Pt and pi-pi interactions. Control of the host-guest assembly process by varying the solvent composition can lead to a change from discrete host and guest molecules to high-ordered host-guest oligomers with the formation of sheet-like nanostructures, demonstrating a rare example of three-state supramolecular host-guest system with high solubility in solvents of diverse polarity. The change in host-guest assembly behaviors could be probed by drastic color changes from yellow to orange to green. The present study provides insights into the systematic design of solvent-responsive molecular materials using molecular tweezers-directed host-guest assembly, with potential applications in colorimetric sensing of changes in the micro-environment.

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