Comparative Catalytic Properties of Supported and Encapsulated Gold Nanoparticles in Homocoupling Reactions

Frontiers in Chemistry
Wongi JangJun-Hyun Kim

Abstract

This report describes strategies to increase the reactive surfaces of integrated gold nanoparticles (AuNPs) by employing two different types of host materials that do not possess strong electrostatic and/or covalent interactive forces. These composite particles are then utilized as highly reactive and recyclable quasi-homogeneous catalysts in a C-C bond forming reaction. The use of mesoporous TiO2 and poly(N-isopropylacrylamide), PNIPAM, particles allows for the formation of relatively small and large guest AuNPs and provides the greatly improved stability of the resulting composite particles. As these AuNPs are physically incorporated into the mesoporous TiO2 (i.e., supported AuNPs) and PNIPAM particles (i.e., encapsulated AuNPs), their surfaces are maximized to serve as highly reactive catalytic sites. Given their increased physicochemical properties (e.g., stability, dispersity, and surface area), these composite particles exhibit notably high catalytic activity, selectivity, and recyclability in the homocoupling of phenylboronic acid in water and EtOH. Although the small supported AuNPs display slightly faster reaction rates than the large encapsulated AuNPs, the apparent activation energies (Ea) of both composite particles...Continue Reading

References

Aug 21, 2003·Journal of Colloid and Interface Science·Rakesh Kumar SharmaAmarnath Maitra
Sep 3, 2008·Chemical Society Reviews·Avelino Corma, Hermenegildo Garcia
Dec 10, 2009·ChemSusChem·Loredana De RogatisPaolo Fornasiero
May 3, 2012·Physical Chemistry Chemical Physics : PCCP·R FengerK Rademann
Nov 26, 2013·Accounts of Chemical Research·Laura Prati, Alberto Villa
Jun 24, 2015·Chemistry, an Asian Journal·Sangita KaranjitHidehiro Sakurai
Mar 7, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Liane M RossiCamila P Ferraz
Jun 20, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Jianhua LüChangli Lü
Oct 23, 2018·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Wongi JangJun-Hyun Kim
Aug 27, 2019·Frontiers in Chemistry·Tatyana Tabakova
Nov 7, 2019·Materials·Neel NarayanRobert Vajtai
Nov 22, 2019·Frontiers in Chemistry·Sónia A C Carabineiro

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Methods Mentioned

BETA
surface plasmon resonance
light scattering
X-ray
differential scanning calorimetry
atomic absorption spectroscopy

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