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Title: Highly Stable Copper Nanoparticles Linked to Organic Frameworks as Recyclable Catalyst for Three-Component Click Cycloaddition in Water
Authors: Prakash, S P
Gopidas, K R
Keywords: Click chemistry
Heterogeneous catalyst
Supported catalysts
Issue Date: 16-Sep-2016
Publisher: Wiley-VCH
Citation: ChemistrySelect, 15(1):4803–4813
Abstract: Synthesis, characterization and catalytic applications of highly stable copper-nanoparticles linked to aromatic frameworks are reported. Synthesis of these nanoparticles was achieved in a one-pot reaction which involved the simultaneous reduction of CuCl2.2H2O and 4,4’-biphenylene-bis-diazonium tetrafluoroborate using sodium borohydride. Copper atoms formed upon reduction of Cu ions undergo clustering, leading to the formation of copper nanoparticles. At the same time, 4,4’-biphenylene-bis-diazonium tetrafluoroborate are converted to biphenylene biradicals, which undergoes rapid addition reactions with each other and also on to the nanoparticle surfaces resulting in the formation of aromatic framework linked Cu nanoparticles. Four different types of nanoparticles were prepared by varying the concentration of the metal salts and the ligands. The structure and morphology of these materials were studied using XRD, XPS, SEM and HRTEM analysis. The materials were found to be very good catalysts for click reactions between azides and alkynes and exhibited TOF values as high as 305400 h−1. They also efficiently catalyzed the one-pot click reactions involving azide precursors, sodium azide and alkyne. TOF up to 99000 h−1 were observed for these reactions.
Appears in Collections:2016

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