The IOF6- anion: the first example of a pentagonal bipyramidal AX5YZ species

Fluoride ion transfer and stabilisation of reactive ions

“…Species with higher acceptor properties than the solvent will accept the fluoride. Very unusual inorganic ions have been generated by the method mainly in the laboratories of Christe, Seppelt and Schrobilgen (Scheme 6 [6,[46][47][48][49][50][51][52][53][54][55] …”

Fluxional seven-coordinated fluorido- and oxofluoridotantalates

“…À (Christe et al, 1995), IOF 6 À (Christe, Dixon, Mahjoub et al, 1993Mahjoub et al, , 1991, TeOF 6 2À (Christe, Dixon, Sanders et al, 1993b; and IO 2 F 5 2À (Boatz et al, 2003). This PB structure is never completely ideal.…”

“…The IOF 6 À anion here is an exception. The doublet-sextet pattern in its 19 F NMR spectrum indicates a rigid species, which is probably due to considerable doublebond character of the I-O bond which locks the O atom into an axial position and thus prevents further intramolecular exchange (Christe, Dixon, Mahjoub et al, 1993.…”

Mean amplitudes of vibration of molecules and ions with interhalogen bonds and related species

“…Mean amplitudes of vibration (in Å ) of the three F 4 XO À anions at some selected temperatures [114] Mean amplitudes of vibration for the second isoelectronic pair, the pentagonal-bipyramidal anions F 6 IO À /F 6 TeO 2À [118,119], are presented in Table 24 [120]. In both cases, the mean amplitude values for the X-F equatorial bonds are somewhat higher than those corresponding to the respective axial bonds, confirming that the last ones are slightly stronger.…”