Ferrocene-gold complexes

As on other occasions, the reaction of a metallic complex, such as the trinuclear [p-S Au2(p-dppf) (dppf = l,l/-bis(diphenylphosphino)ferrocene), with [Au(C6F5) (tht)] leads to the preparation of a new organometallic gold complex of higher nuclearity, [ x3-S Au(C6F5) Au2(p-dppf) ] [Eq. (47)], in which the sulfur atom bridges the three gold centers.148... 

Figure 10. A self-assembled monolayer comprised of terminal porphyrins, intermediate ferrocences, and surface thiols attached on gold surface. The sold line is the photoaction spectrum, the dashed line is the absorption spectrum. Panels a) and b) show the proposed mechanisms, and c) provides the structure of the thiol ferrocene-porphyrin complex.

As part of a wider study of the chemistry of ferrocene derivatives containing organophosphorus groups, Laguna and co-workers have prepared and structurally characterised ylide complex (57). Other gold complexes containing coordinated ylides reported include mononuclear species (58), (59) and di-nuclear complex (60) which were obtained from the reactions of the ylides or... 

Through a series of solubility experiments, it has been proved that the presence of a water thin layer surrounding the surface particles was required to stabilize the CD/ferrocene inclusion complexes. Flocculation of gold nanoparticles has also been achieved by the same author using dimeric ferrocene guest (Figure 6). ... 

The electroactive labels most used in genosensing design are ferrocene and its derivates [24-27] (the reversible oxidation process of ferrocene can be detected by means of several electrochemical techniques), osmium complexes [28], platinum complexes [29], gold complexes [30, 31], and metallic [32-36] or semiconductor nanoparticles [37]. Among the last ones, gold nanoparticles are the most used, their detection can be carried out by means of the measurement of resistance or capacitance changes, usually after an amplification procedure with silver, or by means of the anodic stripping voltammetry of Au(lll) obtained after the nanoparticle oxidation Fig. 9.3. 

Gold complexes also find a range of potential applications. A monolayer of adsorbed dibutyldithiocarbamate can be generated on a gold electrode at 0.5 V, which is displaced as the thiuram disulfide upon exposure to hydroxide (1836). Ferrocenyl-substituted dithiocarbamates (Fig. 254) have also proved useful for the modification of gold and platinum microelectrodes and a monolayer of the redox active ferrocene centers is generated (1837). 

Coordination of pentafluorophenyl gold(III) to the two free N-donor atoms in 1,1 -bis(2-pyridylthio)ferrocene leads to the dinuclear complex [ Au(C6F5)3 2 Fc(Spy)2 ] structurally characterized [149]. 

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