27Al NMR behavior of aluminum alkoxides

A series of aluminum oxides [Al(OR) 3] n was prepared and the 27Al NMR spectra were measured at 52.13 MHz. The existence of three types of structures differing in the character of their spectra was proved: a dimeric form prevails with bulky R alkyls, a tricyclic tetrameric form dominates in sterical...

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Bibliographic Details
Published in:Journal of magnetic resonance (1969) 1984-12, Vol.60 (3), p.375-381
Main Authors: Kříž, O, Čásenský, B, Lyčka, A, Fusek, J, Heřmánek, S
Format: Article
Language:English
Subjects:
Atomic and molecular physics
Exact sciences and technology
General molecular conformation and symmetry
stereochemistry
Molecular properties and interactions with photons
Physics
Properties of molecules and molecular ions
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Summary:A series of aluminum oxides [Al(OR) 3] n was prepared and the 27Al NMR spectra were measured at 52.13 MHz. The existence of three types of structures differing in the character of their spectra was proved: a dimeric form prevails with bulky R alkyls, a tricyclic tetrameric form dominates in sterically nondemanding n-alkyls and a linear trimeric form occurs in medium size α-branched alkyls. A cyclic trimer was not found in the compounds studied. Depending on the reaction conditions and temperature, two or more oligomers were found to coexist.
ISSN:0022-2364
1557-8968
DOI:10.1016/0022-2364(84)90048-9