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Updated: May 31, 2025

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
Published on: August 23, 2018
Photofunctional cyclophane host-guest systems.
Swadhin Garain1, Frank Würthner1,2
1Institut für Organische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany. wuerthner@uni-wuerzburg.de.
This review explores cyclophane-based supramolecular complexes that precisely control light-emitting properties. These advanced host-guest systems offer novel photofunctions beyond natural examples.
Area of Science:
- Supramolecular Chemistry
- Photochemistry
- Materials Science
Background:
- Nature offers limited examples of matrix-controlled photofunctions, such as rhodopsin and GFP.
- Cyclophane-based supramolecular host-guest complexes provide a versatile platform for advanced photofunction modulation.
Purpose of the Study:
- To review cyclophane-based host-guest systems for modulating excited-state properties.
- To highlight applications in fluorescence switching, chiroptical functions, and triplet state manipulation.
Main Methods:
- Utilizing bay-functionalized perylene bisimide cyclophanes for fluorescence switching and chiroptical properties.
- Investigating π-extended perylene bisimide cyclophanes for multiple guest binding and circularly polarized luminescence (CPL).
- Exploring triplet-generating cyclophanes (coronene bisimide) for intersystem crossing (ISC) modulation, triplet sensitization (phosphorescence, TADF), and triplet harvesting.
Main Results:
- Demonstrated on-off fluorescence switching and chiroptical functions with perylene bisimide cyclophanes.
- Showcased CPL from π-extended perylene bisimide cyclophanes with multiple guest binding.
- Achieved modulation of excited-state pathways and triplet sensitization via guest encapsulation in coronene bisimide cyclophanes.
- Enabled ambient triplet harvesting using supramolecular strategies with Pt(acac)2 or charge-transfer complexes.
- Stabilized triplet excitons in aerated solutions using supramolecular nanoenvironments.
- Presented triplet-triplet annihilation (TTA) upconversion and host-guest applications in organic light-emitting diodes (OLEDs).
Conclusions:
- Cyclophane-based supramolecular chemistry offers advanced control over photofunctions, exceeding natural limitations.
- These systems enable sophisticated applications including tunable luminescence, triplet state manipulation, and energy upconversion.
- Host-guest interactions within cyclophanes are key to designing novel photoluminescent materials and devices like OLEDs.
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