Ternary hydroxide complexes in neutral solutions of Al3+ and F-.
Especially in G protein systems AlF4- has been claimed as an activating species serving as a tetrahedral phosphate analog. However, in aqueous solutions (H2O)2AlF4- is hexacoordinate with two bound water molecules. In neutral solutions five different mixed OH- and F- complexes of Al3+ comprise the main species under usual experimental conditions. Comparison of the mole fraction distribution curves with limited results on the activity as a function of ambient F- concentrations suggests an activating complex composed of Al3+ with three F- and uncertain geometry. Even fewer activity data suggest a tetrahedral Be2+ complex with three F-.
Martin
R B
RB
Department of Chemistry, University of Virginia, Charlottesville 22903.
D000535:Aluminum; D017607:Aluminum Compounds; D005459:Fluorides; D005461:Fluorine; D006878:Hydroxides; D012996:Solutions
D017607:Aluminum Compounds; D006878:Hydroxides; D012996:Solutions; C050992:tetrafluoroaluminate; D005461:Fluorine; D000535:Aluminum; D005459:Fluorides