Palladium (Pd)-catalysed cross coupling reactions have revolutionized and transformed
modern organic chemistry, yet facing the problem of high cost and recyclability, which
demands innovative and sustainable alternatives.1,2 Recent studies highlight the role of
Plasmonic and Mie resonance in C-C coupling reactions, particularly the Mie resonance, which
considered both electric and magnetic properties of light, facilitate electron transfer from lower
energy level to high energy level while minimizing thermal energy loss. The plasmonic material
(such as Au, Pd, and Ag) has offered catalytic benefits however, thermal instabilities and high
cost hinder their application.
Herein, we explored a novel approach of synthesizing Pd decorated cupric oxide hybrid nano
cluster (CuO-Pd), an efficient photocatalyst for the Heck coupling reaction, where the desired
product, a substituted alkene, has been formed within 90 minutes. A broadband light source of
wavelength 300-2000 nm has been used as the photo-energy source for this experiment.
Through mechanistic studies, we can clearly distinguish an excited electron-driven
photochemistry versus a light-induced heating mediator reaction. These synergistic effects of
CuO and Pd enhanced the reaction rate and improved catalytic stability, making them suitable
for industrial applications. The procedure aligns with the global sustainability goals and the
2050 carbon emission-reducing target.
Keywords: Photocatalyst, Mie resonance, Plasmonic resonance
References
(1) Addanki Tirumala, R. T. et. al Green Chem. 2019, 21 (19), 5284–5290.
(2) F. Pary, F.; Tirumala, R. T. et.al. Catalysis Science & Technology 2021, 11 (7), 2414–2421.
