Abstract
A set of heteroleptic ethyl zinc β-amidoenoates (1, 2) and β-ketoiminates (3) of the form [LZnEt]2 with varying steric bulk have been synthesised via the reaction of diethylzinc with β-aminoenoate ligands HL1 and HL2 and β-ketoimine HL3. These complexes have been characterised via 1H and 13C NMR, mass spectrometry and single-crystal X-ray diffraction, which unambiguously determined all three structures as dimeric species in the solid state. We observe the unusual dimerisation of 1 and 2 through coordination of the central zinc atom to the methine carbon of the second monomer, which gives these complexes high reactivity. The thermal properties of complex 3 are explored via thermal gravimetric analysis (TGA), to investigate their potential as single-source precursors to zinc oxide, which shows that 3 has a significantly lower decomposition temperature as compared to its bis-ligated counterpart [Zn(L3)2], which gives 3 promise as a single-source precursor to zinc oxide.
Highlights
Introduction βAmidoenoates and β-Ketoiminates.Zinc oxide (ZnO) is widely used as a transparent conducting oxide (TCO) material.TCOs combine high electrical conductivity with optical transparency, making them an essential and industrially important class of material
TCOs such as indium-doped tin oxide (ITO) and fluorine-doped tin oxide (FTO) are the most industrially produced for electronic applications, the scarcity and subsequent rising cost of indium requires a shift towards TCO materials incorporating more abundant elements, such as ZnO [1,2]
We explore the synthesis of a set of heteroleptic ethyl zinc β-amidoenoates and β-ketoiminates with a view to using them as single-source precursors (SSPs) to ZnO.2 ofWe hypothesise that the heteroleptic nature of these complexes will allow for both the high reactivity from the ethyl group while maintaining the stability offered from a chelating ligand
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Deposits upon decomposition [19,20]. We explore the synthesis of a set of heteroleptic ethyl zinc β-amidoenoates and β-ketoiminates with a view to using them as SSPs to ZnO. ofWe hypothesise that the heteroleptic nature of these complexes will allow for both the high reactivity from the ethyl group while maintaining the stability offered from a chelating ligand. Heteroleptic nature of these complexes will allow for both the high reactivity from the ethyl group while maintaining the stability offered from a chelating ligand
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