Synthesis, vibrational and NMR spectroscopic characterization of [N(CH3)4][IO2F2] and X-ray crystal structure of [N(CH3)4]2[IO2F2][HF2]

The solid-state 19F NMR spectrum of [N(CH3)4][IO2F2], a vibrational study of [N(CH3)4][IO3] and [N(CH3)4][IO3]·2H2O, and the X-ray crystal structures of [N(CH3)4][IO2F2] and [N(CH3)4][IO3]

“…The 19 F linewidths did not narrow appreciably upon increasing the spinning rate to 18 kHz, nor did they change with lowering the temperature to À80 8C, ruling out significant 19 F-19 F dipolar coupling and chemical exchange. The isotropic signal for the crystallographically unique fluorine environment is centred at 21 ppm, which is consistent with the chemical shift of 13.7 ppm observed for [N(CH 3 ) 4 ][IO 2 F 2 ] in CH 3 CN solution [13]. The shielding anisotropy, Ds, in Mason's nomenclature [25], has been estimated to be approximately 230 ppm using the program, SIMPSON [26], and reproduces the spinning-sideband manifold, but not the individual lineshapes.…”

“…It has been speculated that anhydrous [N(CH 3 3 ] is also likely to exhibit ferroelectric properties [11]. characterize the IO 2 F 2 À anion in solution by 19 F NMR spectroscopy [13].…”

Sodium iodine(V) oxyfluoride, NaIO2F2

“…2). This IO 2 F 2 À polyhedron is essentially the same as those in KIO 2 F 2 (Abrahams & Bernstein, 1976) (Gerken et al, 2004). Weak I1-O1 bonds are also systematically present in these structures.…”

Alkali Metal (Li+–Cs+) Salts with Hexafluorochromate(V), Hexafluorochromate(IV), Pentafluorochromate(IV), and Undecafluorodichromate(IV) Anions

“…2.27 Å). [52,53] The FHF species in previously mentioned crystal structures are best described as HF molecules that are hydrogen-bonded to fluorine ligands of the [CrF 6 ] octahedra. The F···(H)···F distances in the crystal structures reported herein are all in the range 2.5-3.2 Å. Hydrogen bonds falling in this range are classified as moderate-to-strong hydrogen bonds, which could be described as mostly electrostatic.…”