Stabilization of Cu(0)-nanoparticles into the nanopores of modified montmorillonite: An implication on the catalytic approach for Click reaction between azides and terminal alkynes

• Published in: Green chemistry : an international journal and green chemistry resource : GC 2011-01, Vol.13 (12), p.3453-3460
• Main Authors: BIBEK JYOTI BORAH, DUTTA, Dipanka, PARTHA PRATIM SAIKIA, NABIN CHANDRA BARUA, DIPAK KUMAR DUTTA
• Format: Article
• Language: English
• Subjects: Catalysis; Catalysts: preparations and properties; Chemistry; Colloidal state and disperse state; Exact sciences and technology; General and physical chemistry; Heterocyclic compounds; Heterocyclic compounds with several n hetero atoms in the same ring, in separated rings or in fused rings; Organic chemistry; Physical and chemical studies. Granulometry. Electrokinetic phenomena; Porous materials; Preparations and properties; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
• ISSN: 1463-9262; 1463-9270
• DOI: 10.1039/c1gc16021d

In situ generation of Cu(0)-nanoparticles in the nanopores of modified montmorillonite and their catalytic activity in 1,3-dipolar cycloaddition reactions between azides and terminal alkynes to synthesise 1,2,3-triazoles have been carried out. The modification of montmorillonite was carried out by activation with H2SO4 under controlled conditions for generating nanopores to act as a "host" for the Cu(0)-nanoparticles, which is executed by successful loading of Cu(CH3COO)2 metal precursor through an incipient wetness impregnation technique followed by reduction with NaBH4. A TEM study reveals that Cu(0)-nanoparticles within the size range of 0-10 nm are evenly distributed on the support. The synthesized Cu(0)-nanoparticles exhibit face centered cubic (fcc) lattice geometry and serve as an efficient green catalyst for the "Click" azide-alkyne cycloaddition to afford highly regioselective 1,4-disubstituted 1,2,3-triazoles with excellent yields and selectivity in aqueous medium. The nanocatalysts can be recycled and reused several times without significant loss of their catalytic activity.