| Popis: |
Using an accurate transpiration method, AlF(3) was sublimed near 1200 K into argon containing 0, 0.02, and 0.76 atm of HF, but no reaction between AlF(3) and the HF was detected within the precision (about 1%). Two alternative structures of HAlF(4) are postulated. An upper bound for extent of reaction corresponds to [Formula: see text] > − 33 kcal (− 138 kJ) for AlF(3) (g) + HF (g) = HAlF(4) (g); this indicates a far lower stability of HAlF(4) (g) than that of LiAlF(4) (g) or NaAlF(4) (g) when formed similarly. |
