Gallium(II) Compounds Stabilized by β-Diketonate Ligands: Synthesis, Characterization, and X-ray Structural Studies of [GaCl(acac)]2 and [GaCl(tmhd)]2

Two new gallium(II) derivatives, [GaCl(acac)]2 (acac = acetylacetonate and [GaCl(tmhd)]2 (tmhd = 2,2,6,6-tetramethyl-3,5-heptanedionate), have been prepared and characterized by X-ray structural studies, partial elemental analyses, physical properties, and their 1H NMR, 13C NMR, and IR spectra. Both compounds have direct gallium−gallium bonds between two tetracoordinated gallium atoms with each in the +2 oxidation state and with each gallium bonded to a chloride and a chelated β-diketonate ligand. Metal−metal bond lengths are Ga(1)−Ga(1a) = 2.396(3) A for the acac derivative (which has crystallographically imposed C2 symmetry) and Ga(1)−Ga(2) = 2.391(2) A for the tmhd derivative.