Gold 5-coordinate complexes

Thallium(i) Derivatives of Nickel, Palladium, Platinum, and Gold Coordination Complexes 395... 

Table 14 Palladium, platinum, and gold coordination complexes that bind thallium...

Mirabelli CK, Sung CM, Zimmerman JP, Hill DT, Mong S, Crooke ST (1986) Interactions of gold coordination complexes with DNA. Biochem Pharmacol 35 1427-1433... 

Gold coordination complexes as anticancer agents, I. Kostova, Anti-Cancer Agents Med. Chem., 2006,6,19. 

Although 6 Is most prevalent, a coordination number of 4 Is also common, and several important complexes have a coordination number of 2. In addition, a few complexes display coordination numbers of 3, 5, and 7. Examples of coordination number 2 include the silver-ammonia complex and the gold-cyanide complex, both described in Chapter 18. To minimize ligand-ligand repulsions, a complex with a coordination number of 2 is invariably linear, as Figure 20-6 shows. 

A second separation technique is leaching, which uses solubility properties to separate the components of an ore. For example, modem gold production depends on the extraction of tiny particles of gold from gold-bearing rock deposits. After the rock is crushed, it is treated with an aerated aqueous basic solution of sodium cyanide. Molecular oxygen oxidizes the metal, which forms a soluble coordination complex with the cyanide anion ... 

Laguna, A. and Laguna, M. (1999) Coordination chemistry of gold(II) complexes. Coordination Chemistry Reviews, 193-195, 837-856. 

Uson, R., Laguna, A., Vicente, J., Garcia, J., Jones, P.G. and Sheldrick, G.M. (1981) Preparation of three- and four-coordinate gold(I) complexes crystal structure of bis [o-phenylenebis(dimethylarsine)]gold(I) bis(pentafluorophenyl)aurate. Journal of the Chemical Society, Dalton Transactions, (2), 655-657. 

Cronje, S., Raubenheimer, H.G., Spies, H.S.C., Esterhuysen, C., Schmidbaur, H., Schier, A. and Kruger, G.J. (2003) Synthesis and characterisation of N-coordinated pentafluorophenyl gold(I) thiazole-derived complexes and an unusual self-assembly to form a tetrameric gold(I) complex. Dalton Transactions, (14), 2859-2866. 

Fernandez, E.J., Lopez-de-Luzuriaga, J.M., Monge, M., Olmos, E., Laguna, A., Villacampa, M.D. and Jones, P.G. (2000) Trinuclear gold(I) complexes with various coordination modes of N,N-dimefhyldithiocarbamate. Journal of Cluster Science, 11(1), 153-167. 

The discriminatory emission properties between two-coordinate d ° gold(I) complexes and their respective three-coordinate counterparts have been demonstrated in the literature [6, 10-13]. As discussed in the later sections, Che and coworkers have rationalized that the extraordinarily large Stokes shift of the visible emission of [Au2(diphosphine)2] from the [5da 6pa] transition is due to the exciplex formation ofthe excited state with solvent or counterions [6]. Fackler [14—16] reported the photophysical properties of monomeric [AUL3] complexes, which show visible luminescence with large Stokes shifts (typically lOOOOcm ), suggesting significant excited-state distortion. Gray et al. [10] examined the spectroscopic properties of... 

R = Ph, Pr). Modification of their luminescence properties upon formation of three-coordinate gold(I) complexes. Inorganic Chemistry, 42, 2061-2068. 

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