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BY-NC-ND 3.0 license Open Access Published by De Gruyter June 2, 2014

Trimethylaminoxidaddukte an Tetrakis[bis(trimethylsilyl)methyl]dialuminoxan: R2Al – O – AlR2 · ONMe3 und R2Al – O – AlR2 · 2ONMe3 mit gewinkelten Al – O – Al-Gruppen / Adducts of Trimethylaminoxide with Tetrakis[bis(trimethylsilyl)methyl]dialuminoxane: R2Al – O – AlR2 · ONMe3 and R2Al – O – AlR2 · 2ONMe3 with Bent Al – O – A l Groups

  • Werner Uhl , Matthias Koch , Siegfried Pohl , Wolfgang Saak , Wolfgang Hiller and Maximilian Heckel
From the journal Zeitschrift für Naturforschung B
https://doi.org/10.1515/znb-1995-0428
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The sterically highly shielded and monomeric tetrakis[bis(trimethylsilyl)methyl]dialuminoxane R2Al - O - AlR2 (R = CH(SiMe3)2) 1 forms 1:1 and 1:2 adducts on treatment with trimethylamine oxide. Both products have been characterized by crystal structure determination. Contrary to the linear educt 1, the complexes show bent Al - O - Al groups with bond angles of 162.3 and 161.4°. The mono adduct 2 has three- and four-coordinated Al atoms with a very short Al - O bond between the bridging oxygen and the coordinatively unsaturated Al atom (168.7 pm), possibly indicating a π-interaction. The second bond of the dialuminoxane fragment is lengthened to 175.3 pm and represents a “normal” Al - O distance. The Al - O bond to the amine oxide ligand (184.6 pm) lies within the range o f dative Al - O bonds. As shown by NMR spectroscopy the unsymmetrical structure is preserved in toluene solution up to 90 °C. In the bis(amine-oxide) adduct 3 both A l atoms are four-coordinated with very similar inner Al - O bond lengths o f 173.6 pm.

Keywords: Dialuminoxane; Group of Al - O - Al; Adducts with Trimethylaminoxide
Received: 1994-10-4
Published Online: 2014-6-2
Published in Print: 1995-4-1

© 1946 – 2014: Verlag der Zeitschrift für Naturforschung

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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From the journal
Zeitschrift für Naturforschung B
Zeitschrift für Naturforschung B
Volume 50 Issue 4

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