Synthesis of β-ketoiminate and β-iminoesterate tungsten (VI) oxo-alkoxide complexes as AACVD precursors for growth of WO thin films

Tuning Coordination Geometry of Nickel Ketoiminates and Its Influence on Thermal Characteristics for Chemical Vapor Deposition of Nanostructured NiO Electrocatalysts

“…For all compounds, the Ni–O bond lengths are between 0.042 Å ( 1 ) and 0.114 Å ( 5 ) shorter than the Ni–N bond length, which is in accordance with other transition metal β-ketoiminates. ,,,,,, It is evident that the octahedral compound ( 2 ) exhibits considerably longer Ni–O (1.995 Å) and Ni–N (2.034 Å) bond lengths, compared to the other complexes within this study. This can be explained by the additional electron density at the metal center, induced by the etheric side chain coordination.…”

“…38 For all compounds, the Ni−O bond lengths are between 0.042 Å (1) and 0.114 Å (5) shorter than the Ni−N bond length, which is in accordance with other transition metal βketoiminates. 21,22,27,29,33,37,38 It is evident that the octahedral compound ( 2 In the case of compound 5, the square planar geometry results in a layered stacking of the individual molecules with an intermolecular distance of 3.441 Å (as shown in Figure S1). The distance between the exposed Ni(II) center and the ketoiminate O(1) of the neighboring molecule is calculated to be approximately 3.698 Å. Theses bond distances are significantly longer than the etheric side chain coordination of compound (2).…”

“…Despite these new developments, there is definitely a dearth of suitable precursors for Ni. Lately, Schiff-base type ligand systems such as β-ketoiminates have gained increasing attention for Ni and other transition metals such as Zn, Co, Cu, Ce, W, and Fe, due to their high volatility and increased reactivity compared to their β-diketonate counterparts, as well as the easy tunability of their volatility and reactivity through substitution of the imino side chain. − To the best of our knowledge, the earliest report on nickel β-ketoiminates was published by Everett and Holm in 1965, where the solution equilibria between tetrahedral and square-planar isomers was investigated . However, this study was not focused on developmental precursor chemistry.…”

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

“…2 Previously reported zinc bis-amidoenoates (A and B), ethyl zinc amidoenoate dimers (C and D) and tungsten amidoenoate complexes (E and F). [32][33][34] Differing steric profiles are highlighted in pink.…”

“…2, E and F), generating a range of tungsten oxide precursors with interesting molecular geometries which afforded W:O ratio control in the resulting thin films depending on the deposition temperature used. 34 As zinc and tungsten AME systems have been investigated previously and afforded viable oxide precursors, AME ligands at group 13 centres, such as aluminium and gallium may result in similarly successful precursors to these oxides, which have a range of applications including solar cells, abrasives and sensors. 35,36 Here, we investigate AME ligands at aluminium and gallium centres as precursors towards aluminium oxide (-Al 2 O 3 ) or gallium oxide (-Ga 2 O 3 ) respectively.…”