TRIMETALLIC ALUMINUM AND GALLIUM ALKYL COMPLEXES WITH TETRADENTATE (N2O2) LIGANDS

The present work describes the synthesis and characterization of a ser ies of complexes of formula LAIR(AlR(2))(2) (R = Et, L = Salean (1), S alpan (2), Salophan (3), Salomphan (4); R = (i)Bu, L = Salean (5), Sal pan (6), Salophan (7), Salomphan (8)). The use of the comparatively bu lky (i)Bu group in 5 results in a complex which adopts a cis ligand co nfiguration as shown by an X-ray structural analysis. The trimetallic complexes display H-1 NMR spectra that are consistent with a rigid sol ution-state geometry. The presence of a deshielding interaction betwee n the protons on the alkyl group 13 reagent and the arylamine backbone s of the Salophan and Salomphan ligands will be discussed. Additionall y, the crystal structures of SalophanGaMe(GaMe(2))(2) (9) and Salompha nGaMe(GaMe(2))(2) (10) are reported.