Heterogeneous Catalysis by Gold Clusters

Huang, Jiahui; Haruta, Masatake

doi:10.1002/9783527675906.ch11

Cited by 4 publications

(2 citation statements)

References 102 publications

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“…Among the noble metals, gold shows enormous catalytic activity. Following the work by Haruta et al , on ultrafine gold particles smaller than 10 nm, several studies investigated the catalytic activity of gold. , The area has been reviewed previously. ,,− …”

Section: Applicationsmentioning

confidence: 99%

Atomically Precise Clusters of Noble Metals: Emerging Link between Atoms and Nanoparticles

2017

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Atomically precise pieces of matter of nanometer dimensions composed of noble metals are new categories of materials with many unusual properties. Over 100 molecules of this kind with formulas such as Au 25 (SR) 18 , Au 38 (SR) 24 , and Au 102 (SR) 44 as well as Ag 25 (SR) 18 , Ag 29 (S 2 R) 12 , and Ag 44 (SR) 30 (often with a few counterions to compensate charges) are known now. They can be made reproducibly with robust synthetic protocols, resulting in colored solutions, yielding powders or diffractable crystals. They are distinctly different from nanoparticles in their spectroscopic properties such as optical absorption and emission, showing well-defined features, just like molecules. They show isotopically resolved molecular ion peaks in mass spectra and provide diverse information when examined through multiple instrumental methods. Most important of these properties is luminescence, often in the visible−near-infrared window, useful in biological applications. Luminescence in the visible region, especially by clusters protected with proteins, with a large Stokes shift, has been used for various sensing applications, down to a few tens of molecules/ions, in air and water. Catalytic properties of clusters, especially oxidation of organic substrates, have been examined. Materials science of these systems presents numerous possibilities and is fast evolving. Computational insights have given reasons for their stability and unusual properties. The molecular nature of these materials is unequivocally manifested in a few recent studies such as intercluster reactions forming precise clusters. These systems manifest properties of the core, of the ligand shell, as well as that of the integrated system. They are better described as protected molecules or aspicules, where aspis means shield and cules refers to molecules, implying that they are "shielded molecules". In order to understand their diverse properties, a nomenclature has been introduced with which it is possible to draw their structures with positional labels on paper, with some training. Research in this area is captured here, based on the publications available up to December 2016.

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Section: Applicationsmentioning

confidence: 99%

Atomically Precise Clusters of Noble Metals: Emerging Link between Atoms and Nanoparticles

2017

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“…Interestingly, despite the profound interest in heterogeneous gold catalysis and its indisputable role in fine chemical synthesis, Au-catalyzed alkyne coupling studies are scarce, with only a handful of homogeneously catalyzed examples reported . In addition, 1,3-diynes have been observed as side products in Sonogashira coupling catalyzed by Au/CeO 2 (Boronat et al focused on the alkyne coupling itself) and Au/La 2 O 3 (but not Au/SiO 2 ) or in surface reactions performed under vacuum without isolating the products .…”

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confidence: 99%

Subnanometer Gold Clusters on Amino-Functionalized Silica: An Efficient Catalyst for the Synthesis of 1,3-Diynes by Oxidative Alkyne Coupling

et al. 2017

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Subnanometer (d = 0.8 ± 0.2 nm) gold particles homogeneously dispersed on amino-functionalized silica catalyze Glaser-type alkyne coupling, providing corresponding 1,3-diynes under mild conditions. Readily available λ3-iodane PhI(OAc)2 is used as an oxidant and 1,10-phenanthroline is used as an additive. Ten symmetrical 1,3-diynes and three products of heterocoupling containing various functionalities are isolated in high yields. The catalyst can be recycled at least five times, giving consistently high isolated yields and maintaining the size and distribution of gold clusters. This unique combination of stable subnanometer gold clusters and hypervalent iodine thus paves a hitherto unexplored avenue in organic synthesis employing heterogeneous gold catalysis.

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Spectroscopy and catalytic activity study of gold supported on barium titanate nanotubes for styrene epoxidation

Nepak

Srinivas

2016

Applied Catalysis A: General

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Heterogeneous Catalysis by Gold Clusters

Cited by 4 publications

References 102 publications

Atomically Precise Clusters of Noble Metals: Emerging Link between Atoms and Nanoparticles

Atomically Precise Clusters of Noble Metals: Emerging Link between Atoms and Nanoparticles

Subnanometer Gold Clusters on Amino-Functionalized Silica: An Efficient Catalyst for the Synthesis of 1,3-Diynes by Oxidative Alkyne Coupling

Spectroscopy and catalytic activity study of gold supported on barium titanate nanotubes for styrene epoxidation

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