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The reactions of two diazabutadiene ligands, Ar-DAB (ArNCH) 2, Ar = 2, 6-Pri2C6H3 and But-DAB (ButNCH) 2 with either GaI or an AlI3/Al mixture have afforded the paramagnetic compounds, IGaII (But-DAB) 2, I2GaIII (But-DAB) and I2AlIII (Ar-DAB) which have been characterised by X-ray crystallography and EPR spectroscopy. In addition, the diamagnetic, ionic complex, I2AlIII (Ar-DAB) I, has been prepared and structurally characterised. The reduction of I2GaIII (Ar-DAB) with potassium metal in the presence of various Lewis bases has led to three structurally characterised compounds, (Et2O) KGaI (Ar-DAB) 2, (TMEDA) KGaI (Ar-DAB) 2 and: GaI (Ar-DAB) 2K (18-crown-6) 2 (μ-18-crown-6), which contain the second example of an anionic gallium (I) carbene analogue. In addition, the former two compounds display Ga⋯Ga interactions in the solid state which are unprecedented for this complex type.
Baker et al. (Tue,) studied this question.