Recent Research Developments

For the chemical vapor deposition of gallium-containing films, there is interest in developing nonpyrophoric, alternative precursors to trimethyl or triethyl gallium. It is also desirable for these precursors to minimize carbon contamination. Gallium hydride complexes that do not contain direct gallium-carbon bonds are attractive candidates. Dr. Bing Luo and Benjamin E. Kucera working with Professor Wayne L. Gladfelter have reported (Chemical Communications, advance article) a new gallium hydride that is stabilized by a tridentate amido-diamine ligand.

Bis(2-dimethylaminoethyl)amido gallane, H₂GaN(CH₂CH₂NMe₂)₂, that melts at 27 °C, is easily distilled and remains stable upon heating at 55 °C for two days, was synthesized either from the reaction of the quinuclidine adduct of monochlorogallane with the lithium salt of the corresponding amine, or from the reaction of trimethylamine gallane and the amine; the latter reaction (Scheme 1) affords an unusual co-product with both GaH₂ and GaH₃ bonded to a same amido nitrogen.

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