Gallium electron pair bases

The choice of acid or base for solvent is simplified appreciably for melts containing complex ions (as a rule, they are anions), which are prone to the acid-base dissociation. Dissociation of this ion is assumed as the intrinsic acid-base equilibrium of a melt of such kind. In this case, the simpler eliminated anion will be considered as the base of the solvent and the coordinationally unsaturated residue will be the acidic particle of the solvent. Naturally, the division of particles formed by the auto-dissociation into acids and bases is made on the basis of the Lewis definition [13] an acid is the acceptor of an electron pair and a base is the donor of this electron pair. Ionic melts based on complex halides of gallium(III) [28], aluminium(III) [29] and boron(III) [30,31] may serve as examples of successful application of the above approach. The electron-deficient covalent halide (e.g. A1C13, BF3) in these melts is the solvent acid, and the corresponding halide ion is the base of the solvents ... 

Reactivity studies of two-coordinate chelate group 13 species have Just begun and appear particularly interesting because such species may exhibit both a Lewis acid character (due to the sextet configuration at the metal center) and a Lewis base one (due the lone pair of electrons at the metal center) see Lewis Acids Bases). For instance, the two-coordinate Ga chelate HC(CMeNAr)2 Ga reacts with B(C6F5)3 to form the gallium-boron donor-acceptor complex HC(CMeNAr)2 Ga... 

---