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Issue 5, 2006
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Organoaluminium complexes with sterically demanding oximato ligands: does a bulky and rigid ligand backbone change the aggregation motif?

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Abstract

The four organoaluminium ketoximates [(2,4-dimethylpentane-3-one oximato)AlMe2]2 (1), (meso)-[(norcamphor oximato)AlMe2]2 (2), {[(R,R)-camphor oximato]AlMe2}3 (3) and {[(R,S)-fenchone oximato]AlMe2}2 (4) have been prepared by the reactions of the corresponding oximes with trimethylaluminium. All compounds have been fully characterized by means of IR, mass and multi-nuclear NMR spectroscopy (1H, 13C, 27Al) and by elemental analyses. The crystal structures of three of these compounds (2, 3 and 4) were determined, revealing the aggregation motif of organometallic group 13 oximates to vary from the hitherto predominant six-membered dimeric M2N2O2 array to others (six-membered M3O3 core ring in the case of the camphor derivative; five-membered M2NO2 core ring in the case of the fenchone derivative) so far only found e.g. in hydroxylamino complexes of group 13 metals. Furthermore, complexes 3 and 4 exhibit an unusual behaviour in solution, as indicated by upfield-shifted additional signals in their 27Al NMR spectra, pointing at aluminium atoms in penta- or hexacoordination, respectively.

Graphical abstract: Organoaluminium complexes with sterically demanding oximato ligands: does a bulky and rigid ligand backbone change the aggregation motif?

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Publication details

The article was received on 05 Jul 2005, accepted on 13 Sep 2005 and first published on 31 Oct 2005


Article type: Paper
DOI: 10.1039/B509511E
Citation: Dalton Trans., 2006,0, 714-721

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    Organoaluminium complexes with sterically demanding oximato ligands: does a bulky and rigid ligand backbone change the aggregation motif?

    M. Ullrich, N. W. Mitzel, K. Bergander and R. Fröhlich, Dalton Trans., 2006, 0, 714
    DOI: 10.1039/B509511E

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