Syntheses and Characterization of W(NC6F5)F5- and W2(NC6F5)2F9- Salts and Computational Studies of the W(NR)F5- (R = H, F, CH3, CF3, C6H5, C6F5) and W2(NC6F5)2F9- Anions

Crystal structure of an ordered [WOF5]- salt: (1,10-phen-H)[WOF5] (1,10-phen = 1,10-phenanthroline)

The crystal of structure of (1,10-phen-H)[WOF₅], a rare example of a [WOF₅]⁻ salt in which the oxygen and fluorine atoms are ordered, is reported.

Crystals of 1,10-phenanthrolinium penta­fluorido­oxidotungstate(VI), (1,10-phen-H)[WOF₅] (1,10-phen = 1,10-phenanthroline, C₁₂H₈N₂), were obtained upon hydrolysis of WF₆(1,10-phen) in CH₃CN at 193 K. The (1,10-phen-H)[WOF₅] salt contains a rare example of a [WOF₅]⁻ anion in which the oxygen and fluorine atoms are ordered. This ordering was verified by bond-valence determinations and structural comparisons with [Xe₂F₁₁][WOF₅] and Lewis acid-base adducts of WOF₄ with main-group donor ligands. The crystal packing is controlled by N—H⋯F hydrogen bonding that is directed exclusively to the axial F atom as a result of its increased basicity caused by the trans influence of the oxido ligand.