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Synthesis, Structure, and Properties of Gallium Compounds with the Heterodifunctional [2-(N,N-Dimethylamino)ethyl]cyclopentadienyl Ligand1

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journal contribution
posted on 15.10.1996 by Peter Jutzi, Michael Bangel, Beate Neumann, Hans-Georg Stammler
Several new gallium compounds containing the [2-(N,N-dimethylamino)ethyl]cyclopentadienyl ligand (CpN) are described. Reaction of the respective element halide with CpNK 1 leads to the compounds 2−6 of the type [2-(Me2NCH2CH2)C5H4]GaX2 [2:  X = Cl; 3:  X = Br; 4:  X = I; 5:  X = CH3; 6:  X = H]. Each compund was characterized by 1H and 13C NMR spectroscopy, mass spectrometry, and elemental analysis; the molecular structures of 2−5 were determined by X-ray crystallography. In the solid state and presumably also in solution all compounds feature a monomeric structure with an intramolecularly coordinated dimethylamino group. The resulting coordinative and electronic saturation of the metal center leads to a drastically decreased reactivity against moisture and air. The observed dynamic behavior in solution is based on fast haptotropic shifts in a “windscreen-wiper” type process. Sufficient volatility and well-behaved fragmentation makes 6 a suitable precursor for the deposition of gallium in the MOCVD process.