title: Molecular versus ionic structures in adducts of GaX3 with monodentate carbon-based ligands.
abstract: A molecular donor-acceptor adduct has been isolated by the reaction of the N-heterocyclic carbene 1,3-dimethyl imidazol-2-ylidene (diMe-IMD) with GaCl(3). In contrast, the structurally related, yet much more nucleophilic, 1,3-dimethyl-2-methylene-2,3-dihydro-1H-imidazole (diMe-MDI) gave rise to ion pairs of type [L(2)GaX(2)][GaX(4)], where X = Cl, Br, or I. With IBioxMe(4), a N-heterocyclic carbene that is more nucleophilic than diMe-IMD, the outcome of the reaction was dependent on the nature of the halide. Ionic 1:1 adducts between monodentate ligands and GaX(3) salts have only one precedent in the literature. The peculiar behavior of carbon-based ligands was explained on the basis of their electronic properties and reaction kinetics.
authors.affiliation: ICMMO (UMR CNRS 8182), Université Paris-sud, 91405 Orsay Cedex, France.
authors.forename: Ahmad
authors.initials: A
authors.lastname: El-Hellani
authors.forename: Julien
authors.initials: J
authors.lastname: Monot
authors.forename: Régis
authors.initials: R
authors.lastname: Guillot
authors.forename: Christophe
authors.initials: C
authors.lastname: Bour
authors.forename: Vincent
authors.initials: V
authors.lastname: Gandon