Monolayer protected gold clusters

Systematic Synthesis of Monolayer-Protected Gold Clusters with Well-Defined Chemical Compositions... 

Hostetler MJ, Templeton AC, Murray RW. Dynamics of place-exchange reactions on monolayer-protected gold cluster molecules. Langmuir 1999 15 3782-3789. 

Templeton AC, Hostetler MJ, Warmoth EK, Chen SW, Hartshorn CM, Krishnamurthy VM, Forbes MDE, Murray RW. Gateway reactions to diverse, polyfunctional monolayer-protected gold clusters. J Am Chem Soc 1998 120 4845-4849. 

Figure3.9 Brust-Schiffrin method for the synthesis of monolayer protected gold clusters. Reproduced from reference [62] by permission of The Royal Society of Chemistry.

Other modifications to the reaction conditions of the Brust-Schiffrin method, such as a reduction temperature of — 78 °C and the use of a hyperexcess of hexanethiol, results in an Au38(thiolate)24, based on observations, LDI-TOF mass spectrometry, TGA analysis and elemental analysis [69]. The influence of preparation temperature on the size and monodispersity of dodecylthiol monolayer protected gold clusters has also been reported. Both and SAXS measurements show that higher temperatures increase polydispersity. This modification of poly-dispersity may be related to the existence of a dynamic exchange of thiols at the particle surface with thiols in the solvent [70]. 

In a recent report, 19- or 20-residue thiolated oligonucleotides were used in an exchange reaction with glutathione monolayer-protected gold clusters. After thiol substitution, the resulting DNA-nanoparticle conjugates can be separated by gel electrophoresis on the basis of the number of bound oligonucleotides and assembled with one another by DNA-DNA hybridization [151]. 

T. Huang R. W. Murray, Visible Luminescence of Water-Soluble Monolayer-Protected Gold Clusters. f Phys. Chem. B 2001, 105, 12498-12502. 

J. F. Hicks A. C. Templeton S. Chen K M. Shehan R. Jasti R. W. Murray J. Debord T. G. Schaaff R. L. Whetten, The Monolayer Thickness Dependence of Quantized Double-Layer Capacitances of Monolayer-Protected Gold Clusters. Anal. Chem. 1999, 73, 3703-3711. 

In 2002, the group of Rolinson [21] reported the use of gold-titania composite aerogels for room temperature oxidation of carbon monoxide. Alkanethiolate monolayer-protected gold clusters with a well controlled size distribution were added to the Ti(IV) precursor during the sol-gel chemistry. After calcination the Au particles aggregate to average diameters of 5-10 nm. 

Nanometer-sized monolayer-protected gold clusters functionalized with anthraquinone by using l-(l,3-dithiapropyl)anthracene-9,10-dione were used to mediate electroreduction of 1,1-dinitrocyclohexane [54a]. The enhancement in catalytic efficiency for cluster-bound anthraquinone compared to its monomer was ascribed to the smaller diffusion coefficient of the cluster-bound... 

Callari F, Petraia S, Sortino S. 2006. Efighly photoresponsive monolayer protected gold clusters by self assembly of a cyclodextrin azobenzene derived supramolecular complex. Chem Commun 1009 1011. 

Templeton, A. C., Pietron,J. J., et al. Solvent Refractive Index and Core Charge Influences on the Surface Plasmon Absorbance of Alkanethiolate Monolayer-Protected Gold Clusters. The Journal of Physical Chemistry B,104(3), 564-570 (2000). 

Wang G, Murray RW (2004) Controlled assembly of monolayer-protected gold clusters by dissolved DNA. Nano Lett 4 95-101... 

McIntosh CM, Esposito EA 3rd, Boal AK et al (2001) Inhibition of DNA transcription using cationic mixed monolayer protected gold clusters. J Am Chem Soc 123 7626-7629... 

In other notable examples depicted in Figure 5.11, Lee and coworkers [60] developed a system based on a monolayer-protected gold cluster, where the... 

Rotello and coworkers were among the first to demonstrate that the preorganization of host units on AuNPs, forming so-called mixed monolayer protected (gold) clusters... 

Gu T, Whitesell JK, Fox MA (2003) Energy transfer from a surface-bound arene to the gold core in ca-fluorenyl-alkane-l-thiolate monolayer-protected gold clusters. Chem Mater 15 1358-1366... 

Huang T, Murray RW (2001) Visible luminescence of water-soluble monolayer-protected gold clusters. J Phys Chem B 105 12498-12502... 

Brennan JL, Keyes TE, Forster RJ (2011) Electrochemical properties of ruthenium metallopolymer monolayer-protected gold cluster nanocomposites. J Electroanal Chem 662(l) 30-35... 

Templeton, A., Hostetler, M., Kraft, C. and Murray, R., Reactivity of monolayer-protected gold cluster molecules steric effects, J. Am. Chem. Soc., 120, 1906-1911 (1998). 

Wolfe, R. L., Balasubramanian, R., Tracy, J. B., Murray, R. W. FuUy ferrocenated hexanethiolate monolayer-protected gold clusters. Langmuir 2007, 23, 2247-2254. 

The type II reaction of p-alkylalkanophenones in n-butyl stearate has been studied.The E/C ratio in the reaction depends on the length of their two-alkyl chains. The type II elimination occurs exclusively from alkyl aryl ketones on monolayer protected gold clusters (Scheme 6). Although the ketones are not... 

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