Interaction with gold clusters

Interaction of Oxygen with Gold 5.2.1. Interaction with gold clusters12 

The term cluster is, following common practice, reserved for small assemblies of atoms formed in the vapour phase or in matrix isolation, to distinguish them from particles, which are formed by chemical or physical means, often with the collaboration of a support. The preparation of gaseous clusters has been briefly described in Section 3.2.2 they can be 

The structure of the complexes formed when gold clusters react with oxygen is not always certain, and in particular it is not certain whether the oxygen molecule is dissociated or not.3 Clearly if it is to dissociate, the transfer of charge from the cluster to the molecule must be the first step, but what must happen thereafter if dissociation into atoms is to occur is far from obvious. Some light is cast on this problem by the observation of the vibrational fine structure in the ultraviolet photoelectron spectrum (UPS) of the Au —O2 and Au)C -O2 complexes.8,9 Subsidiary peaks at 179 and 152 meV compare with those found elsewhere for the O2 ion at 80-120 meV and for the 0 ion at 135-150 meV (ImeV = 8.06 cm 1) this suggests 

Oxygen molecules react with Au - OH clusters only when n is even.12 It is worth noting that an AU-O2 complex has been detected in matrix isolation chemistry. When gold atoms and oxygen were co-condensed with a rare gas at extremely low temperature, a green complex was formed in which the oxygen was bonded sideways on. 

There have been a number of theoretical studies of small gold clusters and their reactivity with oxygen,1,8,13-21 but because of the different DFT methodologies (see Appendix at the end of this chapter) used it is scarcely surprising that the answers are qualitatively different. Most of the calculations confirm the experimental observations, and add some gloss to them the most recent calculations agree extraordinarily well with experimental 

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Interaction with gold clusters. In [211-213], 4c-DFT calculations were performed for Hg and Cn interacting with gold clusters, Au . Since the stmcture of the... 

The chapter focused on the weak binding phosphine and pyridine ligands in interaction with gold clusters and nanoparticles. In order to learn... 

Rousseau, R. and Marx, D. (2000) The interaction of gold clusters with methanol molecules Ab initio molecular dynamics ofAUn CH3OH and AunCH30H./owmn of Chemical Physics, 112, 761-769. 

Prediction of interaction between metal clusters with oxide surface The HSAB principle classifies the interaction between acids and bases in terms of global softness. In the last few years, the reactivity index methodology was well established and had found its application in a wide variety of systems. This study deals with the viability of the reactivity index to monitor metal cluster interaction with oxide. Pure gold cluster of a size between 2 and 12 was chosen to interact with clean alumina (100) surface. A scale was derived in terms of intra- and intermolecular interactions of gold cluster with alumina surface to rationalize the role of reactivity index in material designing [43]. 

B. Yoon, H. Hakkinen, and U. Landman, Interaction of O2 with gold clusters molecular and dissociative adsorption, J. Phys. Chem. A 107,4066-4071 (2003). 

Sterrer M, Yulikov M, Fischbach E, et al. Interaction of gold clusters with color centers on MgO(OOl) films. Angew Chem Int Ed. 2006 45 2630-2. 

Nitrogen- and phosphine-binding ligands in interaction with gold atoms, clusters, nanoparticles and surfaces... 

Figure 4.46 Orbital interaction diagram for the Au6C framework in (H3PAu)6C2+showing the important bonding interactions of the carbon 2s and 2p orbitals with the MOs of the gold cluster. (Reprinted from J. Organomet. Chem., 384, 405, 1990, with kind permission from Elsevier Science S.A., P.O. Box 564, 1001 Lausanne, Switzerland.)...

Kruger, D., Fuchs, H., Rousseau, R., Marx, D. and Parinello, M. (2001) Interaction of short-chain alkane thiols and thiolates with small gold clusters Adsorption structures and energetics. Journal of Chemical Physics, 115, 4776-4786. 

The interaction of adsorbed thiol molecules with gold nanoparticles as a function of the mean particle size has also been studied [180]. Monochromated X-ray Photoelectron Spectroscopy (MXPS) measurements showed the attachment of the thiol sulfur headgroup onto the cluster surface leading to a positive BE shift in the Au 4f corelevel. No line width broadening could be observed indicating that the thiol-gold interaction affects the whole... 

In order to deposit gold on the supports with high dispersion as nanoparticles (NPs) and clusters, there are at least nine techniques which can be classified into five categories well mixed precursors, specific surface interaction, mixing gold colloids [18], physical deposition [19,20], and direct reduction [21]. The former two categories are schematically presented in Figure 3. 

Decene complexes with gold, 12 348 Deformation density, 27 29-33 Degradation reactions, heteronuclear gold cluster compounds, 39 336-337 Dehydration reactions, osmium(II), 37 351 Delocalization, see also Valence delocalization added electron, reduced dimer, 38 447, 449 optical centers, interaction with surroundings, 35 380 Density... 

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