Pachfule, Pradip and Panda, Manas K. and Kandambeth, Sharath and Shivaprasad, S. M. and Diaz Diaz, David and Banerjee, Rahul (2014) Multifunctional and robust covalent organic framework-nanoparticle hybrids. JOURNAL OF MATERIALS CHEMISTRY A, 2 (21). pp. 7944-7952. ISSN 2050-7488, 2050-7496
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Highly dispersed Pd(0) nanoparticles were successfully immobilized into a stable, crystalline and porous covalent organic framework (COF), TpPa-1, by a solution infiltration method using NABH(4) as a reducing agent. High resolution and dark field TEM images confirmed the uniform loading of the Pd(0) nanoparticles into the TpPa-1 matrix without aggregation. This hybrid material exhibited excellent catalytic activity towards the Cu free Sonogashira, Heck and sequential one pot Heck-Sonogashira cross-coupling reactions under basic conditions, and with superior performance compared to commercially available Pd supported on activated charcoal (i.e., 1, 5 and 10 wt%). Additionally, the precursor Pd(II)-doped COF also displayed competitive catalytic activity for the intramolecular oxidative biaryl synthesis under acidic conditions. Both catalysts were found to be highly stable under the reaction conditions showing negligible metal leaching, non-sintering behavior, and good recyclability. To the best of our knowledge, the organic support used in this work, TpPa-1, constitutes the first COF matrix that can hold both Pd(0) nanoparticles and Pd(II) complex without aggregation for catalytic purposes under both highly acidic and basic conditions.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CROSS-COUPLING REACTIONS; SUPPORTED PALLADIUM CATALYSTS; METAL NANOPARTICLES; HETEROGENEOUS CATALYSIS; PD NANOPARTICLES; COPPER-FREE; COORDINATION POLYMERS; SONOGASHIRA REACTION; REUSABLE CATALYST; HYDROGEN STORAGE; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Organische Chemie > Arbeitskreis Prof. Dr. David Díaz Díaz |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 29 Nov 2019 09:21 |
| Last Modified: | 29 Nov 2019 09:21 |
| URI: | https://pred.uni-regensburg.de/id/eprint/11002 |
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