Issue 9, 2008

Group 13 decamethylmetallocenium cations

Abstract

Salts containing the decamethylmetallocenium cations, [(C5Me5)2M]+ (or Cp*2M+) of the group 13 “metals” B, Al and Ga have been prepared using a variety of synthetic routes. Precursor molecules of the type Cp*2MX (X = Cl, Br, Me) exhibit structural features that vary significantly depending on the size and electronegativity of the central atom. While salt metathesis, halide abstraction and methanide abstraction methods represent viable routes for the preparation of salts of Cp*2B+ and Cp*2Al+, acidolysis of a Cp* group from Cp*3Ga is the most reliable method for the synthesis of the analogous gallium cation. Gallocenium cations are less stable than either of the lighter congeneric cations since they prove to be susceptible to decomposition reactions involving the “back-transfer” of ligands from the counter anion. Density functional theory (DFT) calculations revealed that, whereas Cp*2Ga+ is predicted to adopt a molecular structure more similar to that of Cp*2B+, the electronic structure of the gallium cation bears a greater resemblance to that of Cp*2Al+.

Graphical abstract: Group 13 decamethylmetallocenium cations

Supplementary files

Article information

Article type
Paper
Submitted
22 Oct 2007
Accepted
06 Nov 2007
First published
18 Dec 2007

Dalton Trans., 2008, 1161-1176

Group 13 decamethylmetallocenium cations

C. L. B. Macdonald, J. D. Gorden, A. Voigt, S. Filipponi and A. H. Cowley, Dalton Trans., 2008, 1161 DOI: 10.1039/B716220K

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