Complex fluoroanions in solution. IX. BF 3 –anion complexes and their disproportionation

Complex fluoroanions have been prepared with boron trifluoride and perchlorate, nitrate, nitrite, acetate, formate, azide, cyanide, cyanate, thiocyanate, and thiophenolate ions. The complexes formed from the anions of the strong acids, except the hydrogen halides, do not disproportionate to BF 2 (anion) 2 − . Complexes of anions of weaker acids may disproportionate and, or, complex a second molecule of BF 3 . Regularities in fluorine–boron coupling constants are tabulated.