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Palladium-Schiff Base Complexes Encapsulated in Zeolite-Y Host: Functionality Controlled by the Structure of a Guest
Susheela Kumari1, Karthik Maddipoti1, Bidisa Das2
1Birla Institute of Technology and Science , Pilani , Rajasthan 333031 , India.
Inorganic Chemistry
|January 11, 2019
Summary
Palladium-Schiff base complexes encapsulated in zeolite-Y exhibit altered electronic properties and enhanced catalytic activity for the Heck reaction. These novel heterogeneous catalysts offer easy separation and recyclability.
Area of Science:
- Coordination Chemistry
- Materials Science
- Catalysis
Background:
- Schiff base ligands are versatile in coordinating with metal ions.
- Zeolite encapsulation offers a unique microenvironment for catalytic applications.
- Palladium complexes are crucial in various organic transformations, including the Heck reaction.
Purpose of the Study:
- To synthesize and characterize palladium-Schiff base complexes.
- To investigate the effect of zeolite-Y encapsulation on complex properties.
- To evaluate the catalytic performance of encapsulated complexes in the Heck reaction.
Main Methods:
- Synthesis of tetradentate Schiff base ligands and their palladium complexes.
- Encapsulation of complexes within zeolite-Y using the flexible ligand method.
- Characterization using XRD, SEM-EDS, BET, thermal analysis, XPS, IR, and UV-vis spectroscopy.
- Catalytic evaluation in the Heck reaction.
Main Results:
- Successful synthesis and characterization of free and zeolite-Y encapsulated palladium-Schiff base complexes.
- Observed red shift in d-d transitions for encapsulated complexes, indicating structural modifications.
- Enhanced and modified catalytic activity of encapsulated complexes in the Heck reaction.
- Demonstrated reusability of the heterogeneous encapsulated catalysts.
Conclusions:
- Zeolite-Y encapsulation significantly alters the structural and electronic properties of palladium-Schiff base complexes.
- Encapsulated complexes serve as efficient, recyclable heterogeneous catalysts for the Heck reaction.
- The flexible ligand method within zeolite supercages is effective for catalyst preparation.
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