Issue 1, 2022

Investigations into the structure, reactivity, and AACVD of aluminium and gallium amidoenoate complexes

Abstract

Amidoenoate (AME = {ethyl-3-(R-amido)but-2-enoate}) complexes of aluminium and gallium, of the type: [AlCl2(AMER)] R = iPr (1-Al); [AlCl(AMER)2] R = iPr (2-Al), Dip (3-Al); [GaCl2(AMER)] R = iPr (1-Ga) and [GaCl(AMER)2] R = iPr (2-Ga), Dip (3-Ga), have been synthesised (iPr = isopropyl, Dip = 2,6-diisopropylphenyl). The coordination chemistry of these complexes has been studied in relation to precursor suitability. Investigations into the reactivity of the aluminium and gallium amidoenoate complexes involved reactions with hydride sources including alkali metal hydride salts, alkylsilanes, and magnesium hydride species and magnesium(I) dimers. The isolation of alkyl metal amidoenoate precursors including an aluminium hydride amidoenoate, [AlH(AMEDip)2] (4-Al) and dimethyl gallium amidoenoates [GaMe2(AMEDip)] (4-Ga), [GaMe2(AMEiPr)] (5-Ga) concluded the synthetic studies. A selection of the isolated complexes were used as precursors for aerosol assisted chemical vapour deposition (AACVD) at 500 °C. Thin films of either amorphous Al2O3 or Ga2O3 were deposited and subsequently annealed at 1000 °C to improve the materials’ crystallinity. The films were characterised by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), UV-visible (UV-vis) spectroscopy and energy dispersive X-ray analysis (EDXA).

Graphical abstract: Investigations into the structure, reactivity, and AACVD of aluminium and gallium amidoenoate complexes

Supplementary files

Article information

Article type
Paper
Submitted
05 Okt. 2021
Accepted
30 Nov. 2021
First published
01 Dec. 2021
This article is Open Access
Creative Commons BY license

Dalton Trans., 2022,51, 156-167

Investigations into the structure, reactivity, and AACVD of aluminium and gallium amidoenoate complexes

K. L. Mears, M. A. Bhide, C. E. Knapp and C. J. Carmalt, Dalton Trans., 2022, 51, 156 DOI: 10.1039/D1DT03365D

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