Biotechnological synthesis of Pd/Ag and Pd/Au nanoparticles for enhanced Suzuki–Miyaura cross-coupling activity
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Wiley
Date
2021-03Referencia bibliográfica
Kimber, R. L., Parmeggiani, F., Neill, T. S., Merroun, M. L., Goodlet, G., Powell, N. A., ... & Lloyd, J. R. (2021). Biotechnological synthesis of Pd/Ag and Pd/Au nanoparticles for enhanced Suzuki–Miyaura cross‐coupling activity. Microbial Biotechnology. [doi:10.1111/1751-7915.13762]
Sponsorship
UK Research & Innovation (UKRI) Biotechnology and Biological Sciences Research Council (BBSRC) BB/L013711/1 BB/R010412/1Abstract
Bimetallic nanoparticle catalysts have attracted considerable
attention due to their unique chemical and
physical properties. The ability of metal-reducing
bacteria to produce highly catalytically active
monometallic nanoparticles is well known; however,
the properties and catalytic activity of bimetallic
nanoparticles synthesized with these organisms is
not well understood. Here, we report the one-pot
biosynthesis of Pd/Ag (bio-Pd/Ag) and Pd/Au (bio-Pd/
Au) nanoparticles using the metal-reducing bacterium,
Shewanella oneidensis, under mild conditions.
Energy dispersive X-ray analyses performed using scanning transmission electron microscopy
(STEM) revealed the presence of both metals (Pd/Ag
or Pd/Au) in the biosynthesized nanoparticles. X-ray
absorption near-edge spectroscopy (XANES) suggested
a significant contribution from Pd(0) and Pd
(II) in both bio-Pd/Ag and bio-Pd/Au, with Ag and Au
existing predominately as their metallic forms.
Extended X-ray absorption fine-structure spectroscopy
(EXAFS) supported the presence of multiple
Pd species in bio-Pd/Ag and bio-Pd/Au, as inferred
from Pd–Pd, Pd–O and Pd–S shells. Both bio-Pd/Ag
and bio-Pd/Au demonstrated greatly enhanced catalytic
activity towards Suzuki–Miyaura cross-coupling
compared to a monometallic Pd catalyst, with
bio-Pd/Ag significantly outperforming the others. The
catalysts were very versatile, tolerating a wide range
of substituents. This work demonstrates a green synthesis
method for novel bimetallic nanoparticles that
display significantly enhanced catalytic activity compared
to their monometallic counterparts.