Pentafluorophenylgold complexes

When 4, 4 -dimethyl-2 -(2-thienyl)-2 -oxazoline lithiated at is reacted with [Au (C6F5)(tht)] the neutral nitrogen-coordinated pentafluorophenylgold complex and not the expected monocarbene complex [68] is obtained. 4-Methylthiazole, 4-methyl-2-mehylsulfanylthiazole and piperidine react with [Au(C6F5)(tht)] forming the complexes shown in Figure 3.4 [73]. 

Applications of the pentafluorophenylgold complexes have been mentioned when appropriate throughout the chapter. Catalytic reactions, vapochromic behavior. 

CiS-Au(PPh3)(C6F5)2CI N2H4/BOH Figure 4.34 Some syntheses of a pentafluorophenylgold complex. 

The first synthesized pentafluorophenylgold(I) complex was [Au(C6F5)PPh3[ obtained by the reaction of [AuClPPhs] and CgFsMgBr [30-32]. This complex was at the same time the first characterized [33] by X-ray studies showing the common nearly linear distribution of the phosphorous and the ipso carbon atom (178(1)°). Nowadays, there are many methods of obtaining this complex, in many cases as a by-product of some reaction and, in other cases, its formation is the driving force of the reaction. We will see examples of both in this chapter. 

Table 3.5 Di and trinuclear pentafluorophenylgold(l) derivatives using gold complexes as starting materials.

All known pentafluorophenylgold(I) iron complexes are derivatives of ferrocene. In fact, they are obtained mainly by reaction of [Au(CgF5) (tht)] with modified ferrocenes... 

The complex obtained with ferrocenylmethylpyrazole (9) is noteworthy because the structure [151] shows the molecules associated into pairs via intermolecular Au Au interactions of 3.1204(6) A and these pairs form chains held together by H Au and H F interactions. The 3D supramolecular structure is formed through additional C— H F hydrogen bonds. These types of H F and H Au interactions are not common in pentafluorophenylgold chemistry. 

Heteronuclear Pentafluorophenylgold(l) Chromium, Cold Molybdenum and Cold Tunsten Complexes... 

The most general method of preparing pentafluorophenylgold(III) derivatives is oxidative addition with the appropriate oxidant to the gold(I) complex. The choice of... 

Other oxidants such as TCNQ (7,7, 8,8 -tetracyanoquinodimethane) can be used to oxidize a pentafluorophenylgold(I) complex, as takes place in the case of Q2[Au2(p,-dmit)(C6F5)2], which in the presence of TCNQ evolves in the oxidation of one gold atom giving a gold(III) [108] complex according to Equation 3.20... 

Scheme 3.5 Pentafluorophenylgold(lll) or gold(l)/(lll) complexes with 1,2- diphosphinobenzene.

In the more widely represented pentafluorophenylgold I) gold(111) complexes... 

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