Antimony halides anions

Antimony(III) halides are powerful halide acceptors and form complexes with, for example, monovalent halides to give a variety of interesting structures, e.g. (54)-(56). The tetramethyl-ammonium nonabromodiantimonate(III) dibromine is of interest since the crystal structure contains bromine molecules which bridge the [Sb2Br9]3 anions (56).158... 

One of the more notable features of antimony(V) halide chemistry is the tendency to achieve a CN of six, thus resulting in the facile formation of complex anions, particularly with halide donors (Table 21) the d(Sb—F) depends on the nature of the cation. Their structures are related to the F—Sb- -F interactions between crystal structure units, which is dependent upon the potential field of the cation. 

This method has also been a general method for the synthesis of triorganoantimony and -bismuth compounds. The antimony or bismuth anion (RjM", M = Sb, Bi) reacts with organic halides, which can be either aryl halides such as 18 in equation 21 , or alkyl halides (equations 22 and 23 ), Dimetallated triorganometallic compounds such as 19 which are useful as ligands for transition metals are available from this method (equation 24). ... 

---