Gold interaction

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... 

Aizawa et al. [14] have immobilized mediator-modified glucose oxidase within micropores of a gold black electrode by self-assembling via the thiol-gold interaction. 

Bis-(3,5-di-tert-butyl-l,2,4-triphospholyl)-bis(triethylphosphine)-digold(I) [36] contains an anionic phosphorus donor ligand. In the crystal structure the cation [bis-(triethylphosphine)gold(I)]+andthe anion[bis(3,5-tert-butyl-l,2,4-triphospholyl) aurate(I)]- associate in pairs through gold-gold interactions. 

Compound [Au2Pt4(p3-S)4(PPh3)8]2+ has been prepared from [AuCl(SMe2)] and [Pt2(p.-S)2(PPh3)4]. Its structure shows a short gold-gold interaction (2.837 A) (Figure 2.31) [140]. 

The use of both di- or triphosphines and chalcogenolates as building blocks in the same molecule leads to different species. The trinuclear derivative shown in Figure 2.35 is an example [167]. A more complicated structure is that of Au9(p.-p-tc)6(p.-dppm)4]3+ (p-tc = p-thiocresolate) which exhibits short gold-gold interactions. An emission at 540 nm is observed upon excitation at 450 nm in the solid state at room temperature that increases in intensity at 77 [168]. 

Crystal structures of [Au2(E E)2]2+ (E = chalcogen donor atom) have been described with dithiocarbamate [265-271], xantate [272], MNT [273-275], dithiopho-sphonate [276], dithiophosphinate [277], dithiophosphate [278, 279] or trithiocarbo-nate [280] ligands. The gold-gold interaction in complexes shown in Figure 2.48 has been analyzed by ab initio Hartree-Fock calculations [281]. 

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