Interhalogen cations

A small degree of autoionization of the XX 3 interhalogens is indicated by their electrical conductivity. Some of these compounds have been extensively used as nonaqueous solvents in which their behavior indicates dissociation as shown in the following case for BrF3  

However, such reactions are hardly suitable for generating sufficient concentrations of the cations for study. Therefore, the cations described earlier are all produced by other means. 

In each case, the positive ions are generated by reaction of the trihalide with a strong Lewis 

---

This tendency is so great that it provides a way to produce interhalogen cations such as C1F2+ as shown in the following reaction ... 

In this section, the polyatomic cations of group 17 elements (halogen and interhalogen cations and polycations), cations and polycations of group 16 elements (O, S, Se, and... 

The halogens form many compounds and ions that are binary or ternary combinations of halogen atoms. There are three basic types (a) neutral interhalogen compounds, (b) interhalogen cations, and (c) interhalogen anions. 

Boron trifluoride forms addition compounds that incorporate an sp hybridized boron into a tetravalent structure. Salts of BF4 are readily formed with BF3 and a suitable fluoride donor. Halogen fluorides such as chlorine trifluoride react with BF3 to generate interhalogen cations such as [C1F2]+[BF4]. Some further examples are shown in equations (43) and (44). In an organic application, the Schiemann reaction provides an entry into fluorinated aromatics by thermal decomposition of a diazonimn tetrafluoroborate (equation 45). 

Discuss the role of halide acceptors in the fonnation of interhalogen cations and anions. 

A common reaction of the uncharged interhalogens is with powerful halide acceptors, resulting in interhalogen cations ... 

---