Crystal structures and stability of K2ThF6 and K7Th6F31 on compression

Synthetic Strategies for the Synthesis of Ternary Uranium(IV) and Thorium(IV) Fluorides

“…Similar synthetic considerations can be applied to thorium­(IV) fluorides, which have been more intensively investigated than their U­(VI) counterparts. To date, there have been >80 ternary and 9 quaternary thorium fluoride crystal structures deposited in the ICSD, although many of them are structure redeterminations or a series of structure determinations under high pressure. − The primary difference between thorium and uranium is the absence of a higher than +4 oxidation state for thorium, which prevents in situ reduction as a possible strategy for obtaining thorium fluorides; on the other hand, it is possible to use oxidative fluxes for thorium crystal growth. In this paper, we report on the synthesis and properties of new uranium­(IV) fluorides as well as on the development of hydrothermal and high-temperature synthetic routes leading to thorium­(IV) fluorides.…”

Immobilization of Alkali Metal Fluorides via Recrystallization in a Cationic Lamellar Material, [Th(MoO4)(H2O)4Cl]Cl·H2O

“…For all AF-soaked TMC samples, the intensities of the first coordination shells are significantly higher than those of second coordination shells. These strong peaks for NaF-, KF-, and CsF-soaked samples can be well fitted to nine F atoms with Th–F bonding distances ranging from 2.29(2) to 2.48(2) Å). − The second coordination shells primarily originate from Th–A or Th–F paths. The presence of K 7 Th 6 F 31 in the KF-soaked sample can be further confirmed by their similar EXAFS spectra and fitting results (Figure S3 and Table S3).…”

Twinned caesium cerium(IV) pentafluoride

“…Most of the work on structural inorganic chemistry of actinide fluorides has been primarily based on the materials that crystallize from molten alkali fluoride salts (Grzechnik et al, 2007;Grzechnik et al, 2008;Friese et al, 2011). Recently, several complex thorium fluorides have been synthesized (Underwood et al, 2012;Grzechnik et al, 2013a) and advances in the synthesis of cerium (IV) fluorides have been made (Rouse et al, 2009;Grzechnik et al, 2013b). The successful use of fluoride mineralizers in the hydrothermal crystal growth of alkali thorium fluorides suggests that additional investigations into inorganic cerium (IV) fluorides may be fruitful.…”