(C7H13N2)3Al − The First Tris(diketiminato)metal Complex

Kühn, Norbert; Fuchs, Stefan; Steimann, Manfred

doi:10.1002/1099-0682(200102)2001:2<359::aid-ejic359>3.0.co;2-r

Cited by 10 publications

(2 citation statements)

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“…In the past decade many main group metal containing β-diketiminate structures were synthesised and fully characterized. [13][14][15][16][17][18][19][20][21][22][23][24][25] The presented aluminium(III) and gallium(III) complexes 3-8, which are described in the following, can be compared with many analogue compounds of the Dipp-substituted nacnac ligand. These complexes embrace aluminium(III), gallium(III) and indium(III) compounds and, in the case of Al and Ga, also the reduced species in the oxidation state +I.…”

Section: Introductionmentioning

confidence: 99%

Heterocyclic substituted methanides as promising alternatives to the ubiquitous nacnac ligand

Dauer

2014

Dalton Trans.

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A series of group 13 complexes containing deprotonated bisheterocyclomethanes have been prepared and structurally as well as spectroscopically characterised. In the case of the parent neutral homo-disubstituted bisheterocyclomethanes bis-(benzoxazol-2-yl)-methane (abbreviated as (NCOC6H4)2CH2) (1) and bis-(benzothiazol-2-yl)-methane (abbreviated as (NCSC6H4)2CH2) (2), two interesting ligand systems were investigated with respect to their coordination abilities toward group 13 metals. Upon deprotonation of the acidic methylene bridge in each case a β-diketiminate-like structure is formed, where the negative charge becomes delocalised about the whole ligand framework. There is a mesomeric stabilisation between the carbanionic and the amidic resonance structure. The ligands mentioned above were treated with AlMe3, AlMe2Cl and GaMe3 to achieve deprotonation of the backbone and coincidental metal complexation. The resulting complexes [Me2Al{(NCOC6H4)2CH}] (3), [Me2Al{(NCSC6H4)2CH}] (4), [ClMeAl{(NCOC6H4)2CH}] (5), [ClMeAl{(NCSC6H4)2CH}] (6), [Me2Ga{(NCOC6H4)2CH}] (7), and [Me2Ga{(NCSC6H4)2CH}] (8) were structurally characterized in the solid state by X-ray single crystal diffraction and in solution by different (heteronuclear) 1D/2D-NMR spectroscopic techniques. Each of those molecules shows a nearly planar arrangement with the group 13 metal cation coordinated by the two ring nitrogen atoms of the conjugated heterocycles. Furthermore, in this work (NCOC6H4)3C(C3H7) (9) could be isolated, which might turn out to be a promising analogue of the omnipresent trisoxazoline ligands in asymmetric catalysis.

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Section: Introductionmentioning

confidence: 99%

Heterocyclic substituted methanides as promising alternatives to the ubiquitous nacnac ligand

Dauer

2014

Dalton Trans.

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“…As mentioned, there are only three other tris(β-ketoiminate) aluminium compounds in the literature, Jana's [20] phenyl, Olejník's methoxyaryl, [27] and Altaf's [26] bulkier (4-tertbutylphenyl) complexes, with no alkyl adducts known. Other conventional tris coordinated aluminium complexes featuring bidentate ligands are limited to a range of tris(β-diketonate) aluminium analogues, [25,44] one tris(β-diketimine) aluminium complex, [45] as well as others that employ less comparable ligand systems, such as 8-hydroxyquinoline, that also feature a AlO 3 N 3 core, [46][47][48][49][50] and tris-aluminium alkoxide complexes. [51][52][53]…”

Section: Chempluschemmentioning

confidence: 99%

Tris(β‐ketoiminate) Aluminium(III) Compounds as Aluminium Oxide Precursors

et al. 2023

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Precursor design is the crucial step in tailoring the deposition profile towards a multitude of functional materials. Most commercially available aluminium oxide precursors require high processing temperatures (>500 °C). Herein, we report the tuning of the decomposition profile (200–350 °C) of a range of octahedrally coordinated tris(β‐ketoiminate) aluminium complexes of the type [Al(MeCN(R)CHC=OMe)3], by varying the R substituents in the ligands. The complexes are derived from the reaction of trimethylamine alane (TMAA) and a series of N‐substituted β‐ketoiminate ligands (R‐acnacH, R=Me, Et, iPr, Ph) with varying R‐substituents sizes. When the more sterically encumbered ligand (R=Mes) was used, the Al atom became five‐coordinate, therefore representing the threshold to octahedral coordination around the metal in these type of compounds, which, consequently, lead to a change of decomposition profile. The resulting compounds have been characterised by NMR spectroscopy, mass spectrometry, elemental analysis and single crystal X‐ray diffraction. [Al(MeCN(Me)CHC=OMe)3] has been used as a single source precursor for the deposition of Al2O3. Thin films were deposited via aerosol assisted chemical vapour deposition (AACVD), with toluene as the solvent, and were analysed using SEM, EDX and XPS.

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Synthese und Struktur von Vinamidinatodiiodalanen [1]

Kühn

Fuchs

Steimann

2002

Z. anorg. allg. Chem.

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Professor Michael Hanack zum 70. Geburtstag gewidmet Inhaltsübersicht. Die Diiodalane (C 5 H 7 R 2 N 2 )AlI 2 [6; R ϭ Me (a), Ph (c)] werden durch Umsetzung der entsprechenden Alane (C 5 H 7 R 2 N 2 )AlH 2 (5) und [Me 3 NH]I in guten Ausbeuten erhalten. Hierzu alternativ läßt sich (C 5 H 7 R 2 N 2 )AlI 2 [6; R ϭ iso-Pr (b)], wie Abstract. The diiodoalanes (C 5 H 7 R 2 N 2 )AlI 2 [6; R ϭ Me (a), Ph (c)] are obtained from the corresponding alanes (C 5 H 7 R 2 N 2 )AlH 2 (5) and [Me 3 NH]I in good yields. (C 5 H 7 R 2 N 2 )AlI 2 [6; R ϭ iso-Pr (b)] is alternatively prepared, as well as 6a, from the corresponding vinamidine lithium compound C 5 H 7 R 2 NLi (8) and AlI 3 .

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(C7H13N2)3Al − The First Tris(diketiminato)metal Complex

Abstract: The stable tris(diketiminato)metal complex (C7H13N2)3Al (4) is obtained from Me3N·AlH3 and the vinamidine C7H14N2 (1). The X‐ray structure analysis of the complex 4 reveals a distorted octahedral coordination of the nitrogen atoms at the aluminum centre.

Cited by 10 publications

References 41 publications

Heterocyclic substituted methanides as promising alternatives to the ubiquitous nacnac ligand

Heterocyclic substituted methanides as promising alternatives to the ubiquitous nacnac ligand

Tris(β‐ketoiminate) Aluminium(III) Compounds as Aluminium Oxide Precursors

Synthese und Struktur von Vinamidinatodiiodalanen [1]

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