Hydrogen elimination from secondary amine and phosphine adducts of gallium hydride

1 January 1966

journal article
research article
Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A

p. 706-711
https://doi.org/10.1039/j19660000706

Abstract

The new compounds Me₂NH,GaH₃ and Me₂PH,GaH₃ have been synthesised and their physical and chemical properties investigated. Gas-phase displacement reactions have shown that the order of donor power towards gallium hydride for the various ligands employed lies in the order Me₂NH > Me₃N ∼ Me₃P > Me₂PH. Intramolecular hydrogen elimination from these compounds yields Me₂NGaH₂ and Me₂PGaH₂ respectively, and has been followed by both infrared and proton n.m.r. spectroscopy. The infrared spectrum of Me₂NGaH₂ indicates that the compound is monomeric in the gas phase and is thus the first example of a stable tri-co-ordinate gallium hydride derivative; it is dimeric in benzene solution. Attempts have been made to prepare higher analogues of adducts in the phosphine series, namely, Et₂PH,GaH₃ and Ph₂PH,GaH₃, but these proved to be of low stability. The stability relationships existing between the compounds prepared in this work and similar compounds of boron and aluminium are discussed.

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