Nitrogen Doped Carbon–Silica Based Cu(0) Nanometal Catalyst Enriched with Well-Defined N-moieties: Synthesis and Application in One-Pot Synthesis of 1,4-Disubstituted-1,2,3-triazoles
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A novel, air stable, water dispersible and efficient catalyst based on copper nanoparticles immobilized on nitrogen doped carbons derived from inorganic–organic composite [Cu(0)@NDC-Sil] has been prepared. Doping of carbons i.e. inorganic–organic (silica–starch) composite using 5-phenyl-1,2,3,4-tetrazole, a nitrogen-rich precursor imparts a variety of nitrogen functionalities even at moderate temperature and enables the generation of active sites for the immobilization of Cu(0) nanoparticles. The novel catalyst system has been well characterized by various techniques like SEM, HRTEM, STEM, TGA, CHN, EDX, ICP-AES, XRD and XPS and was found to be highly efficient for the one-pot synthesis of 1,4-disubstituted-1,2,3-triazoles via click chemistry approach with a wide range of substrate scope such as benzyl/allyl halides and alkyl bromides. Moreover, it could be easily recovered by filtration and reused without significant loss in its activity.
KeywordsCu(0) nanoparticles Heterogeneous catalysis Nitrogen doped carbons 1,4-Disubstituted-1,2,3-triazoles Click chemistry
We thank the Head, ACMS, IIT Kanpur for XPS study; Head, SAIF, IIT Bombay for ICP-AES, HR-TEM, STEM and CHN studies; AMRC, IIT Mandi for SEM, EDX and PXRD studies. Financial assistance to authors [CS (JRF, UGC) and MK (JRF, CSIR)] is gratefully acknowledged.