An exafs study of the cluster molecule Au55(PPh3)12Cl6

Fairbanks, Mary C.; Benfield, Robert E.; Newport, Robert J.; Schmid, Günter

doi:10.1016/0038-1098(90)90045-d

Cited by 66 publications

(38 citation statements)

References 14 publications

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“…For a full analysis, it was also necessary to include an f-factor due to the motion of the whole gold cluster. By using instead the Au-Au interatomic distance obtained from EXAFS [5]- [8] and the spring constant corrected for the higher binding energy found by calorimetry [9], the agreement between calculated and measured 8/~'s has now been improved to within 2%. Using the interatomic distance of bulk gold and the spring constant determined from the bulk modulus of gold, the original calculated 8E's were about 10% smaller than the experimental values.…”

Section: Au Msssbauer Spectroscopymentioning

confidence: 99%

“…The icosahedral structural type is the usual one for gold cluster compounds containing fewer metal atoms, typically 11 or 13; their bonding is dominated by covalent radial interactions to the single centrM gold atom [4]. For example, EXAFS measurements show a single nearestneighbour Au-Au distance in Auss(PPh~)12Cls, proving that the cluster cannot have an icosahedral structure [5,6,7,8]. For example, EXAFS measurements show a single nearestneighbour Au-Au distance in Auss(PPh~)12Cls, proving that the cluster cannot have an icosahedral structure [5,6,7,8].…”

Section: Introductionmentioning

confidence: 99%

“…EXAFS at temperatures ranging from 300 K to 8 K [5,6,7,8] bulk gold. Calorimetric study of the thermal decomposition of Aub~(PPh3)~2CI6 into Au(PPh3)2C1 and bulk gold has shown that the two-centre Au-Au binding energy in the cluster is about 25% stronger than in the bulk metal [9].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Electronic structure and bonding of the metal cluster compound Au55(PPh3)12Cl6

Thiel

Benfield

Zanoni

et al. 1993

Z Phys D - Atoms, Molecules and Clusters

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We discuss the electronic structure, bonding and physical properties of the gold cluster compound Auss(PPh3)l~C16.Results from our experimental measurements, including EXAFS, specific heat, MSssbauer, UV-visible and photoelectron spectroscopy, are combined with those of other work to form a consistent physical picture of the system. The bonding in Anss(PPh3)I~CI6 is much more delocalised and nondirectional than in smaller gold cluster molecules. The Au~s cluster exhibits a substantial degree of metallic bonding, while displaying some of the characteristics of a discrete energy level spectrum.

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Section: Au Msssbauer Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Electronic structure and bonding of the metal cluster compound Au55(PPh3)12Cl6

Thiel

Benfield

Zanoni

et al. 1993

Z Phys D - Atoms, Molecules and Clusters

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show abstract

“…A number of authors [46,47,54] have published good quality L 3 edge EXAFS for Au 55 and Au 11 clusters stabilised by a variety of organic ligands. These studies showed that the fcc structure of bulk Au was retained in the clusters, but with a contraction in the nearest neighbour distance of 0.05 -0.1 Å for Au 55 and up to 0.2 Å for Au 11 .…”

Section: Catalytic Metal Clustersmentioning

confidence: 99%

Extended x-ray absorption fine structure studies of the atomic structure of nanoparticles in different metallic matrices

Baker¹,

Roy

Gurman

et al. 2009

J. Phys.: Condens. Matter

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It has been appreciated for some time that the novel properties of particles in the size range 1 -10 nm are potentially exploitable in a range of applications. In order to ultimately produce commercial devices containing nanosized particles, it is necessary to develop controllable means of incorporating them into macroscopic samples. One way of doing this is to embed the nanoparticles in a matrix of a different material, by co-deposition for example, to form a nanocomposite film. The atomic structure of the embedded particles can be strongly influenced by the matrix. Since some of the key properties of materials, including magnetism, strongly depend on atomic structure the ability to determine atomic structure in embedded nanoparticles is therefore very important. This review focuses on nanoparticles, in particular magnetic nanoparticles, embedded in different metal matrices. EXAFS provides an excellent means of probing atomic structure in nanocomposite materials, and an overview of the technique is given. Its application to catalytic metal clusters is described briefly, before giving an account of the use of EXAFS in determining atomic structure in magnetic nanocomposite films. In particular, we focus on cluster-assembled films comprised of Fe and Co nanosized particles embedded in various metal matrices, and show how the crystal structure of the particles can be changed by appropriate choice of matrix material. The work discussed here demonstrates that combining the results of structural and magnetic measurements, as well as theoretical calculations, can play a significant part in tailoring the properties of new magnetic cluster-assembled materials.

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“…The famous Schmid cluster, Au 55 (PPh 3 ) 12 Cl 6 [43] was one of the first size-specific Au NCs studied with XAS in the 1990s [44][45][46]. Au L 3 -edge EXAFS fitting results from a few studies suggested the Au core is likely cuboctahedral instead of icosahedral.…”

Section: Introduction To Gold Nanoclustersmentioning

confidence: 99%

Bonding properties of thiolate-protected gold nanoclusters and structural analogs from X-ray absorption spectroscopy

Chevrier

Yang

Chatt

et al. 2015

Nanotechnology Reviews

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Abstract:Subnanometer, atomically precise thiolateprotected gold nanoclusters represent an important advancement in our understanding of thiolate-protected gold nanoparticles and thiolate-gold chemistry. Aside from being a link between larger gold nanoparticles and small gold complexes, gold nanoclusters exhibit extraordinary molecule-like optical, electronic, and physicochemical properties that are promising for next-generation imaging agents, sensing devices, or catalysts. The success in elucidating a number of unique thiolate-gold surface and gold core structures has greatly improved our understanding of thiolate-gold nanoclusters. Nevertheless, monitoring the structural and electronic behavior of thiolate-protected gold nanoclusters in a variety of media or environments is crucial for the next step in advancing this class of nanomaterials. Not to mention, there are a number of thiolateprotected gold nanoclusters with unknown structures or compositions that could reveal important insights on application-based properties such as luminescence or catalytic activity. This review summarizes some of the recent contributions from X-ray absorption spectroscopy (XAS) studies on the intriguing bonding properties of thiolate-protected gold nanoclusters and some structural analogs. Advantages from XAS include a local structural, site-and elementspecific analysis, suitable for ultra-small particle sizes (1-2 nm), along with versatile experimental conditions.

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An exafs study of the cluster molecule Au55(PPh3)12Cl6

Abstract: The version in the Kent Academic Repository may differ from the final published version. Users are advised to check http://kar.kent.ac.uk for the status of the paper. Users should always cite the published version of record.

Cited by 66 publications

References 14 publications

Electronic structure and bonding of the metal cluster compound Au55(PPh3)12Cl6

Electronic structure and bonding of the metal cluster compound Au55(PPh3)12Cl6

Extended x-ray absorption fine structure studies of the atomic structure of nanoparticles in different metallic matrices

Bonding properties of thiolate-protected gold nanoclusters and structural analogs from X-ray absorption spectroscopy

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