Organic cation salts of the tetrafluoroaluminate anion: yes, it does exist, and yes, it is tetrahedral

The cation salt of the tetrafluoroaluminate anion was investigated because of the lack of evidence to support the existence of such a salt. The structure was determined to be a simple (AlF4-) anion associated with a (PSH+) cation. The anion is tetrahedral and 2-folded disordered around the Al-F(1) axis with average Al-F distances of 1.62 Angstrom and F-Al-F distance of 109 Angstrom. The closest contact between the coordinated fluoride and the chelated proton of the (PSH+) cation was 2.77 Angstrom, indicating that the anion exists with only van der Waals contacts to either cations or anions of the lattice.