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Palladium Nanoparticles in Polyols: Synthesis, Catalytic Couplings, and Hydrogenations
journal contribution
posted on 2019-08-06, 15:05 authored by Isabelle Favier, Daniel Pla, Montserrat GómezAlcohols, in particular
polyols, are well-known for the synthesis
of metal nanoparticles, often acting as reducing agents, solvents,
and stabilizers. Given not only their structural flexibility depending
on the number of OH functions and their inherent H bonding interactions,
but also the wide range of polyol molecular weights readily available,
different physicochemical properties (boiling point, polarity, viscosity)
could be exploited toward the synthesis of well-defined nanomaterials.
In particular, the relevance of the supramolecular structure of polyols
has a fundamental impact on the formation of metal nanoparticles,
thereby favoring the dispersion of the nanoclusters. In the field
of the metal-based nanocatalysis, palladium occupies a privileged
position mainly due to its remarkable versatility in terms of reactivity
representing a foremost tool in synthesis. In this review, we describe
the controlled synthesis of Pd-based nanoparticles in polyol medium,
focusing on the progress in terms of tailoring size, morphology, structure,
and surface state. Moreover, we discuss the use of palladium nanoparticles,
in a polyol solvent, applied in two of the most relevant Pd-catalyzed
processes, i.e., couplings and hydrogenation reactions, including
multistep processes.