Neutral gold

Laguna, A., Laguna, M., Jimenez, J., Lahoz, F. and Olmos, E. (1992) Asymmetric monocationic or neutral gold(ll) complexes X-ray crystal stmcture of [(C6F5)Au(CH2PPh2CH2)2AuPPh3]... 

Figure4.3 Relativistic and nonrelativistic valence 5d and 6s radial densities for neutral gold. The nonrelativistic 5d density is very close to the relativistic 5d3/2 density and shows the largest maximum.

Schroder, D., Hrusak, J., Tomieporth-Oetting, I.C., Klapdtke, T.M. and Schwarz, H. (1994) Neutral Gold(l) Fluoride Does Indeed Exist. Angewandte Chemie International Edition, 33, 212—214. 

Li, G.P. and Hamilton, LP. (2006) Complexes of small neutral gold clusters and hydrogen sulphide A theoretical study. Chemical Physics Letters, 420, 474 79. 

Lithiated thiazols react with (Ph3P)AuGl to a neutral gold thiazolate, which upon alkylation is transformed into the cationic carbene complex, while the reaction with (tht)AuC6Fs followed by alkylation leads to the neutral complex (Scheme 65).260... 

Figure 2. Left equilibrium geometries of the two lowest energy isomeric states of Au clusters obtained using LDA or GGA scalar relativistic pseudo-potentials. The ground state is Au for GGA and Auj for LDA (except for n=6, which LDA structure is also Aue). Right difference in the binding energy per atom of the planar and 3D structures given in the left panel for neutral gold clusters with 6

Gold is one of the least reactive metals in bulk form. However, in recent years a considerable amount of theoretical and experimental works have studied the reactivity of small neutral and charged Au clusters towards different molecules, like H2, O2, CO, and organic radicals " . The reactivity depends on the size and charge state of the cluster. In the previous section we have studied the reactivity towards oxygen adsorption of anionic silver and gold clusters. In this section we study the reactivity of neutral gold clusters towards molecular O2 (subsection 6.1) and CO (subsection 6.2). 

Another type of neutral gold( I) complex is [ AuX(P R3)[ where X is an anionic oxygen or nitrogen donor ligand such as [Au N(S02CF3)2 (PR3)] or [Au(OR)(PR3)] or even [Au(OS02CF3)(PR3)[, which are relevant as catalytically-active species or catalytic precursors [26, 108]. 

Finally, in the neutral gold(III) complex [Au(SCN)(NCS)(ppy)[ (ppy = 2-phenylpyr-idine) [38] and in the ionic mixed-valent product [AuI(CNcHex)2][AuIII(S2C6H4)2] [39] one-dimensional polymers are formed as a consequence of the Au- -S van der Waals... 

The valence 6.60 can be achieved by a neutral gold atom (without a metallic orbital). However, in order for gold to have this valence, aluminum must have valence 3.30, or greater if significant A1—A1 bonds are formed and hence at least 0.6 electron per gold (atom must have been transferred to the aluminum atoms. Indeed, the observed A1—A1 distance 3.00 A for the six aluminum ligates about each aluminum atom corresponds to n = 0.15, and indicates that a significant amount of valence of the aluminum atoms is used in these bonds. It... 

Phthalocyanine is a divalent ligand with a geometry appropriate for forming a four-coordinated square-planar complex and was thought ideal for generating an Au(II) species. The action of AuBr on molten 1,3-diiminoisoindoline in the absence of solvent indeed yields a neutral gold phthalocyanine (63). The EPR spectra of the complex in 1-chloronaphthalene at 77 K clearly showed the presence of Au(II), a d9 ion. The g value is 2.065, comparable to 2.042 for copper and 2.093 for silver phthalocyanine (64, 80). 

A. M. Joshi, W. N. Delgass, K. T. Thomson, Partial oxidation of propylene to propylene oxide over a neutral gold trimer in the gas phase A Density Functional Theory study, J. Phys. Chem. B 110 (2006) 2572. 

---