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Pd loaded amphiphilic COF as catalyst for multi-fold Heck reactions, C-C couplings and CO oxidation

COFs represent a class of polymers with designable crystalline structures capable of interacting with active metal nanoparticles to form excellent heterogeneous catalysts. Many valuable ligands/monomers employed in making coordination/organic polymers are prepared via Heck and C-C couplings. Here, w...

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Autores principales: Mullangi, Dinesh, Nandi, Shyamapada, Shalini, Sorout, Sreedhala, Sheshadri, Vinod, Chathakudath P., Vaidhyanathan, Ramanathan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4603777/
https://www.ncbi.nlm.nih.gov/pubmed/26057044
http://dx.doi.org/10.1038/srep10876
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author Mullangi, Dinesh
Nandi, Shyamapada
Shalini, Sorout
Sreedhala, Sheshadri
Vinod, Chathakudath P.
Vaidhyanathan, Ramanathan
author_facet Mullangi, Dinesh
Nandi, Shyamapada
Shalini, Sorout
Sreedhala, Sheshadri
Vinod, Chathakudath P.
Vaidhyanathan, Ramanathan
author_sort Mullangi, Dinesh
collection PubMed
description COFs represent a class of polymers with designable crystalline structures capable of interacting with active metal nanoparticles to form excellent heterogeneous catalysts. Many valuable ligands/monomers employed in making coordination/organic polymers are prepared via Heck and C-C couplings. Here, we report an amphiphilic triazine COF and the facile single-step loading of Pd(0) nanoparticles into it. An 18–20% nano-Pd loading gives highly active composite working in open air at low concentrations (Conc. Pd(0) <0.05 mol%, average TON 1500) catalyzing simultaneous multiple site Heck couplings and C-C couplings using ‘non-boronic acid’ substrates, and exhibits good recyclability with no sign of catalyst leaching. As an oxidation catalyst, it shows 100% conversion of CO to CO(2) at 150 °C with no loss of activity with time and between cycles. Both vapor sorptions and contact angle measurements confirm the amphiphilic character of the COF. DFT-TB studies showed the presence of Pd-triazine and Pd-Schiff bond interactions as being favorable.
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spelling pubmed-46037772015-10-23 Pd loaded amphiphilic COF as catalyst for multi-fold Heck reactions, C-C couplings and CO oxidation Mullangi, Dinesh Nandi, Shyamapada Shalini, Sorout Sreedhala, Sheshadri Vinod, Chathakudath P. Vaidhyanathan, Ramanathan Sci Rep Article COFs represent a class of polymers with designable crystalline structures capable of interacting with active metal nanoparticles to form excellent heterogeneous catalysts. Many valuable ligands/monomers employed in making coordination/organic polymers are prepared via Heck and C-C couplings. Here, we report an amphiphilic triazine COF and the facile single-step loading of Pd(0) nanoparticles into it. An 18–20% nano-Pd loading gives highly active composite working in open air at low concentrations (Conc. Pd(0) <0.05 mol%, average TON 1500) catalyzing simultaneous multiple site Heck couplings and C-C couplings using ‘non-boronic acid’ substrates, and exhibits good recyclability with no sign of catalyst leaching. As an oxidation catalyst, it shows 100% conversion of CO to CO(2) at 150 °C with no loss of activity with time and between cycles. Both vapor sorptions and contact angle measurements confirm the amphiphilic character of the COF. DFT-TB studies showed the presence of Pd-triazine and Pd-Schiff bond interactions as being favorable. Nature Publishing Group 2015-06-09 /pmc/articles/PMC4603777/ /pubmed/26057044 http://dx.doi.org/10.1038/srep10876 Text en Copyright © 2015, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Mullangi, Dinesh
Nandi, Shyamapada
Shalini, Sorout
Sreedhala, Sheshadri
Vinod, Chathakudath P.
Vaidhyanathan, Ramanathan
Pd loaded amphiphilic COF as catalyst for multi-fold Heck reactions, C-C couplings and CO oxidation
title Pd loaded amphiphilic COF as catalyst for multi-fold Heck reactions, C-C couplings and CO oxidation
title_full Pd loaded amphiphilic COF as catalyst for multi-fold Heck reactions, C-C couplings and CO oxidation
title_fullStr Pd loaded amphiphilic COF as catalyst for multi-fold Heck reactions, C-C couplings and CO oxidation
title_full_unstemmed Pd loaded amphiphilic COF as catalyst for multi-fold Heck reactions, C-C couplings and CO oxidation
title_short Pd loaded amphiphilic COF as catalyst for multi-fold Heck reactions, C-C couplings and CO oxidation
title_sort pd loaded amphiphilic cof as catalyst for multi-fold heck reactions, c-c couplings and co oxidation
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4603777/
https://www.ncbi.nlm.nih.gov/pubmed/26057044
http://dx.doi.org/10.1038/srep10876
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