Size- and Ligand-Specific Bioresponse of Gold Clusters and Nanoparticles: Challenges and Perspectives

2013 ◽  
pp. 189-241 ◽  
Author(s):  
Janine Broda ◽  
Günter Schmid ◽  
Ulrich Simon
Keyword(s):  
Gold Clusters

Crystal structure images of large gold clusters and growing crystals by HRTEM

1984 ◽  
Vol 42 ◽  
pp. 428-429
Author(s):  
L.R. Wallenberg ◽  
J.-O. Bovin ◽  
G. Schmid
Keyword(s):  
Crystal Structure ◽  
Nucleation And Growth ◽  
Close Packing ◽  
Gold Clusters ◽  
Molecular Weight Determination ◽  
Growth Mechanisms ◽  
Starting Point ◽  
Different Types ◽  
Nucleation And Growth Mechanisms ◽  
Points Of View

Metallic clusters are interesting from various points of view, e.g. as a mean of spreading expensive catalysts on a support, or following heterogeneous and homogeneous catalytic events. It is also possible to study nucleation and growth mechanisms for crystals with the cluster as known starting point.Gold-clusters containing 55 atoms were manufactured by reducing (C6H5)3PAuCl with B2H6 in benzene. The chemical composition was found to be Au9.2[P(C6H5)3]2Cl. Molecular-weight determination by means of an ultracentrifuge gave the formula Au55[P(C6H5)3]Cl6 A model was proposed from Mössbauer spectra by Schmid et al. with cubic close-packing of the 55 gold atoms in a cubeoctahedron as shown in Fig 1. The cluster is almost completely isolated from the surroundings by the twelve triphenylphosphane groups situated in each corner, and the chlorine atoms on the centre of the 3x3 square surfaces. This gives four groups of gold atoms, depending on the different types of surrounding.

Aldehyde gold clusters for molecular labeling

1995 ◽  
Vol 53 ◽  
pp. 858-859
Author(s):  
James F. Hainfeld ◽  
Frederic R. Furuya
Keyword(s):  
Covalent Bond ◽  
Aldehyde Group ◽  
Gold Clusters ◽  
Side Reactions ◽  
Amino Groups ◽  
Sodium Cyanoborohydride ◽  
Schiff’S Base ◽  
Protein Molecules ◽  
Hydroxysuccinimide Esters ◽  
Primary Amino

Glutaraldehyde is a useful tissue and molecular fixing reagents. The aldehyde moiety reacts mainly with primary amino groups to form a Schiff's base, which is reversible but reasonably stable at pH 7; a stable covalent bond may be formed by reduction with, e.g., sodium cyanoborohydride (Fig. 1). The bifunctional glutaraldehyde, (CHO-(CH2)3-CHO), successfully stabilizes protein molecules due to generally plentiful amines on their surface; bovine serum albumin has 60; 59 lysines + 1 α-amino. With some enzymes, catalytic activity after fixing is preserved; with respect to antigens, glutaraldehyde treatment can compromise their recognition by antibodies in some cases. Complicating the chemistry somewhat are the reported side reactions, where glutaraldehyde reacts with other amino acid side chains, cysteine, histidine, and tyrosine. It has also been reported that glutaraldehyde can polymerize in aqueous solution. Newer crosslinkers have been found that are more specific for the amino group, such as the N-hydroxysuccinimide esters, and are commonly preferred for forming conjugates. However, most of these linkers hydrolyze in solution, so that the activity is lost over several hours, whereas the aldehyde group is stable in solution, and may have an advantage of overall efficiency.

Redox and Fluorophore Functionalization of Water-Soluble, Tiopronin-Protected Gold Clusters

1999 ◽  
Vol 121 (30) ◽  
pp. 7081-7089 ◽  
Author(s):  
Allen C. Templeton ◽  
David E. Cliffel ◽  
Royce W. Murray
Keyword(s):  
Gold Clusters ◽  
Water Soluble

Single Mn Atom Doping in Chiral Sensitive Assembled Gold Clusters to Molecular Magnet

ACS Nano ◽  
2021 ◽  
Vol 15 (4) ◽  
pp. 6289-6295
Author(s):  
Deepak K. Swain ◽  
Gyanadeep Mallik ◽  
Pooja Srivastava ◽  
Anoop K. Kushwaha ◽  
Parasmani Rajput ◽  
...  
Keyword(s):  
Gold Clusters ◽  
Molecular Magnet

Size Effect in Hydrogenation of Nitroaromatics Using Support-Immobilized Atomically Precise Gold Clusters

2021 ◽  
Vol 125 (6) ◽  
pp. 3327-3336
Author(s):  
Sam Nesbitt ◽  
Matthew Watson ◽  
Vladimir B. Golovko
Keyword(s):  
Size Effect ◽  
Gold Clusters

Photoluminescence enhancement by controllable aggregation and polymerization of octanuclear gold clusters

2021 ◽  
Author(s):  
Biao Yang ◽  
Han Wu ◽  
Liang Zhao
Keyword(s):  
Gold Clusters ◽  
Polymer Backbone ◽  
Photoluminescence Enhancement

An Au8 cluster was decorated by different ligands or incorporated into a polymer backbone to investigate distinguishable aggregation-induced luminescence behaviors.

Effect of Ligand on the Electronic State of Gold in Ligand-Protected Gold Clusters Elucidated by X-ray Absorption Spectroscopy

2021 ◽  
Vol 125 (5) ◽  
pp. 3143-3149
Author(s):  
Tomoki Matsuyama ◽  
Jun Hirayama ◽  
Yu Fujiki ◽  
Soichi Kikkawa ◽  
Wataru Kurashige ◽  
...  
Keyword(s):  
Electronic State ◽  
Absorption Spectroscopy ◽  
Gold Clusters ◽  
X Ray ◽  
X Ray Absorption

How O2-Binding Affects Structural Evolution of Medium Even-Sized Gold Clusters Aun– (n = 20–34)

2021 ◽  
pp. 3560-3570
Author(s):  
Navneet Singh Khetrapal ◽  
David Deibert ◽  
Rhitankar Pal ◽  
Ling Fung Cheung ◽  
Lai-Sheng Wang ◽  
...  
Keyword(s):  
Structural Evolution ◽  
Gold Clusters ◽  
O2 Binding

Gold clusters on WO3 nanoneedles grown via AACVD: XPS and TEM studies

2012 ◽  
Vol 134 (2-3) ◽  
pp. 809-813 ◽  
Author(s):  
Cristina Navío ◽  
Stella Vallejos ◽  
Toni Stoycheva ◽  
Eduard Llobet ◽  
Xavier Correig ◽  
...  
Keyword(s):  
Gold Clusters
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