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Interconversion between multicomponent slider-on-deck and palladium capsule: regulation of catalysis and
Isa Valiyev1, Indrajit Paul1, Yi-Fan Li1
1Center of Micro and Nanochemistry and (Bio)Technology, Organische Chemie I, School of Science and Engineering, Universität Siegen, Adolf-Reichwein-Str. 2, D-57068 Siegen, Germany. schmittel@chemie.uni-siegen.de.
Dalton Transactions (Cambridge, England : 2003)
|February 2, 2024
Summary
A novel palladium-catalyzed transformation releases a biped ligand from a copper complex, forming a new nanocage that encapsulates a guest molecule. This reversible process modulates fluorescence and copper-catalyzed reactions.
Area of Science:
- Supramolecular Chemistry
- Coordination Chemistry
- Catalysis
Background:
- Copper complexes can form intricate supramolecular structures.
- Guest encapsulation within coordination cages is a key area of research.
- Modulating catalytic activity through external stimuli is highly desirable.
Purpose of the Study:
- To investigate the transformation of a copper-based slider-on-deck complex upon treatment with palladium(II) ions.
- To characterize the resulting palladium-containing nanocage and its guest encapsulation.
- To explore the reversibility of this transformation and its impact on fluorescence and catalysis.
Main Methods:
- Synthesis and characterization of the [Cu3(1)(2)]3+ complex.
- Palladium(II) ion treatment to induce structural transformation.
- Guest (G) encapsulation studies.
- Spectroscopic analysis (e.g., fluorescence) for monitoring.
- Investigation of catalytic activity using copper(I) and aza-Hopf cyclization.
Main Results:
- The [Cu3(1)(2)]3+ complex transformed into a [Pd2(2)4(G)]4+ nanocage upon reaction with palladium(II) ions.
- Guest G was successfully encapsulated within the palladium nanocage.
- The transformation was reversible upon addition of DMAP (4-dimethylaminopyridine).
- Modulation of overall fluorescence and copper(I)-catalyzed aza-Hopf cyclization activity was observed.
Conclusions:
- A novel palladium-templated transformation of a copper supramolecular assembly was achieved.
- The resulting nanocage structure allows for guest encapsulation and stimuli-responsive modulation.
- This work demonstrates a method for controlling fluorescence and catalytic activity through reversible structural changes.
