
%0 Journal Article
%A Colton, R 
%A Eller, PG 
%T Aluminium-27 N.M.R. Studies of Aluminum Fluoro Complexes in Dichloromethane Solution: Evidence for the Tetrafluoroaluminate Anion
%J Australian Journal of Chemistry
%D 1989/09/01
%V 42
%N 9
%P 1605-1609
%K 
%R https://doi.org/10.1071/CH9891605
%U https://www.publish.csiro.au/paper/CH9891605 
%X Mixed aluminium chloro/fluoro anions are formed in dichloromethane solution by the interaction of AICl3 and [Ph3PhCH2P][H2F3]. Aluminium-27 n.m.r. studies are restricted to the stoichiometric ranges F/AI from 1 : 1 to 3 : 1 and F/AI > 8 : 1. Between these limits rapid precipitation reactions occur. In the fluoride-rich stoichiometric range there is rapid exchange on the n.m.r. time scale between the aluminium fluoro anion and free fluoride, so that a direct identification of the species by the multiplicity of the resonance is not possible. Indirect evidence strongly suggests that the aluminium species is [AIF4. In the F/AI stoichiometry range from 1 : 1 to 3 : 1 aluminium-27 resonances were observed for all the other possible [AICIxF4-x]- species. Studies on the aluminium \iodo/fluoro system support the identification of [AIF4]-, but the system is labile and the mixed iodo/fluoro species undergo rapid disproportionation. 
