The synthesis and characterization of mono and dinuclear group 13 complexes derived from a Schiff base

The coordination preferences of the tetradentate Schiff base, N,N'-ethylenebis(acetylacetoimine), H(2)L, with a variety of group 13 precursors, led to the formation of a series of mono and binuclear products. The reaction of H(2)L with AlMe(3) and Me(2)GaCl afforded the binuclear complexes, L{Al(Me)(2)}(2)] 1 and H(2)L{GaCl(Me)(2)}(2)], 3, the latter an adduct of the neutral ligand. Treatment of 1 with iodine generated the cationic Al(III) complex, LAl(thf)(2)]I, 2, while the addition of n-BuLi to H(2)L, followed by reaction with GaCl(3) and InCl(3) led to an ionic complex {LGaCl}(2)(μLi)]GaCl(4), 4, an In(III) dimer, LInCl](2), 5 and monomeric LInCl(thf)], 6. In contrast, the reaction of In{N(SiMe(3))(2)}(3)] with H(2)L yielded a homoleptic, air stable, indium complex, L(3)In(2)], 7. All products were definitively characterized by X-ray crystallography and their structures confirmed by pertinent spectroscopic techniques.