Supported bimetallic nanoparticles
are very promising heterogeneous
catalysts for carbon–carbon cross-coupling reactions, though
reports focusing on their synergistic activity for promoting such
reactions are very limited. In the current study, bimetallic Pd–Ag
hybrid nanoparticles supported on carbon quantum dots (CQDs), Pd–Ag@CQDs,
were synthesized by a facile and fast UV-light-driven (365 nm) one-pot
protocol for the first time to investigate such a synergistic activity.
The physico-chemical structural features of the Pd–Ag@CQD nanohybrid
were evaluated by UV–vis, Fourier transform infrared, X-ray
diffraction, electron-dispersive X-ray, and transmission electron
microscopy analyses. The nanohybrid was found to have dimensions in
the range of ca. 3–5 nm. The bimetallic Pd–Ag@CQD nanohybrid
was utilized as an efficient heterogeneous catalyst for promoting
the Suzuki–Miyaura coupling reaction with aryl bromides and
aryl chlorides under ligand-free and ambient conditions. The synergistic
activity of the components of the nanohybrid induced catalytic enhancement
of the cross-coupling reaction in terms of short reaction times (<1
h) and high yields (>90%). The heterogeneous character of the nanohybrid
system also enabled easy separation and recyclability (up to six cycles).
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