Bridging fluoro ligands

An interesting fluoro-containing cluster was reported in 1990 (Watson et al., 1990). In this cluster, formulated as [Yb5Cp6(/i4-F)(/i3-F)2 (/i-F)g], there are three different kinds of bridging fluoro ligands, doubly, triply, and quadruply bridging (Figure 34). The and four Yb atoms... 

Copper-fluoro complexes are more frequently encountered for the Cu ion than for the Cu ion, although not to the extent one might predict. Fluoride bound in a monodentate fashion is extremely rare, while bridging fluoride ligands and coordinated F-containing anions, such as BF4 and PFe", are more coimnon. 8imilar to that found for Cu, chloride is found extensively in Cu chemistry, followed distantly by bromide. Iodide coordination to Cu is, as one might expect, limited seen only in complexes such as [Cu(bipy)I]I. The section on binary and simple compounds above also discusses a number of Cu halide compounds. 

Caulton and coworkers found that fluoride ligands in certain Ir complexes promote oxidative addition reactions [44]. This group s results showed that the fluoride complex lr(H)2F(P Bu2Ph)2 rapidly activated C—H bonds under dehydrogenation conditions. The reactive intermediate in these reactions may be a fluoro-bridged analogue of compounds 4-12, namely [lr(p-F)(P Bu2Ph)2]2. This would explain the improved reactivity in the Ir-catalyzed OHA reaction in the presence of cocatalytic naked fluoride . 

---