Introduction

Schmid, Anne-Françoise

doi:10.4267/2042/15333

Cited by 4 publications

(4 citation statements)

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“…Ph 3 PAuCl, dissolved in benzene or toluene, was treated with gaseous B 2 H 6 at 60 1C to form Au 55 (PPh 3 ) 12 Cl 6 in about 30% yield. 1,22 Several attempts to use NaBH 4 instead of diborane as reducing agent failed, and the reasons can satisfactorily be understood. One function of B 2 H 6 is to reduce Au(I) in the starting compound to Au(0), apart from the six Au atoms linked to chlorine atoms and so having the formal oxidation state +1.…”

Section: Formation Of Ligand-protected Au 13 and Au 55 Clustersmentioning

confidence: 99%

The relevance of shape and size of Au55 clusters

2008

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This critical review deals with the history of Au55(PPh3)12Cl6 and its derivatives from the very beginning in 1981 to date. Au55 clusters obtain their special interest from their ultimate size and their ideal cuboctahedral structure. They are part of the family of so-called full-shell clusters, particles with perfectly completed geometries, also represented by icosahedral Au13 clusters. Bare as well as ligand protected Au55 clusters not only exhibit special chemical and physical stability, but draw their attention particularly from their unique electronic properties. Single electron switching at room temperature becomes possible, giving rise for development of applications in future nanoelectronic devices. A predominantly size-determined property of the 1.4 nm particles becomes obvious with respect of biological response. Au55 clusters indicate an unusual cytotoxicity which seems to be caused by the unusually strong interaction between the 1.4 nm particles and the major grooves of DNA. Only marginally smaller or larger particles show drastically reduced toxicity, whereas significantly larger gold nanoparticles are completely non-toxic. Both, the electronic perspectives as well as the relevance in toxicology are at very early stages of development (75 references).

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Section: Formation Of Ligand-protected Au 13 and Au 55 Clustersmentioning

confidence: 99%

The relevance of shape and size of Au55 clusters

2008

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“…The Au nanoparticles generated have quite narrow size distribution and remain stably dispersed for more than one year. Au nanoparticles smaller than 2.0 nm could be obtained by using triphenylphosphine 18 or thiol-derivatives such as a series of alkanethiols, 14 although the formation of their completely hexagonal network has been a difficult problem. Our self-organized Au nanoparticle monolayer covers the area of ∼0.1 µm 2 on the carbon-coated copper grid, presumably due to a π-π interaction of the TOBIP layer with an adjacent one.…”

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confidence: 99%

Self-Organization of Au Nanoparticles Protected by 2,6-Bis(1‘-(8-thiooctyl)benzimidazol-2-yl)pyridine

et al. 2000

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“…51 At the same time, the same stable electron configuration are commonly observed, 31 as evident in 8-electron Au 11 (PPh 3 ) 8 Cl 3 . Recent convincing evidence shows that one of the first gold nanoclusters to be isolated and thoroughly studied 52 and originally thought to be Au 55 (PPh 3 ) 12 Cl 6 is instead a 58-electron [Au 69 (PPh 3 ) 20 Cl 12 ] À1 . 53 Nanoclusters are different from plasmonic gold nanocrystals in that-due to their relatively small number of metallic (i.e.…”

Section: Metal Nanoclustersmentioning

confidence: 99%

On the nature and importance of the transition between molecules and nanocrystals: towards a chemistry of “nanoscale perfection”

Cademartiri

Kitaev

2011

Nanoscale

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This paper discusses the importance of the transition between molecular compounds and nanocrystals. The boundary between molecular and nanocrystals/nanoclusters can be defined by the emergence of the bulk phase; atoms in the core of the nanoclusters that are not bound to ligands. This transition in dimensions and structural organization is important because it overlaps with the boundary between atomically defined moieties (molecules can be isolated with increasing purity) and mixtures (nanocrystals have a distribution of sizes, shapes, and defects; they cannot be easily separated into batches of structurally identical species). Passing through this boundary, as the size of a structure increases beyond a few nanometres, the information about the position of each atom gradually disappears. This loss of structural information about a chemical structure fundamentally compromises our ability to use it as a part of a complex chemical system. If we are to engineer complex functions encoded in a chemical language, we will need pure batches of atomically defined (truly monodisperse) nanoscale compounds, and we will need to understand how to make them and preserve them over a broad range of length scales, compositions, and timeframes. In this review we survey most classes of monodisperse nanomaterials (mostly nanoclusters) and highlight the recent breakthroughs in this area which might be spearheading the development of a chemistry of "nanoscale perfection".

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Introduction

Cited by 4 publications

References 0 publications

The relevance of shape and size of Au55 clusters

The relevance of shape and size of Au55 clusters

Self-Organization of Au Nanoparticles Protected by 2,6-Bis(1‘-(8-thiooctyl)benzimidazol-2-yl)pyridine

On the nature and importance of the transition between molecules and nanocrystals: towards a chemistry of “nanoscale perfection”

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