Transition metal hexafluoride

Not e added in proof Lattice constants of transition metal hexafluorides, both cubic and orthorhombic, have been published by Siegel and Northrop 286a) recently. 

Tungsten hexafluoride, as well as other transition-metal hexafluorides, exists as a symmetrical octahedral structure with the symmetry point group Oh near room temperature and in a phase of lower symmetry below the transition point [59,60]. The Raman and infrared spectra [61], infrared spectra [62] and NMR [63] were measured. 

Hexavalent. Uranium hexafluoride, UFe, is one of the best-studied uranium compounds in existence due to its importance for uranium isotope separation and large-scale production ( 70 000 tons per year). All of the actinide hexafluorides are extremely corrosive white (U), orange (Np), or dark brown (Pu) crystalline solids, which sublime with ease at room temperature and atmospheric pressure. The synthetic routes into the hexafluorides are given in equation (13). The volatility of the hexafluorides increases in the order Pu < Np < U in the liquid state and Pu < U < Np in the solid state. UFe is soluble in H2O, CCI4, and other chlorinated hydrocarbons, is insoluble in CS2, and decomposes in alcohols and ethers. The oxidative power of the actinide hexafluorides are in line with the transition metal hexafluorides and the order of reactivity is as follows PuFg > NpFg > UFg > MoFe > WFe. The UFe molecule can also react with metal fluorides to form UF7 and UFg. The same reactivity is not observed for the Np and Pu analogs. 

Hovick, J.W. Bartell, L.S. Structural aspects of nanocrystals of transition-metal hexafluorides. J. Phys. Chem. 1998, B 102, 534—539 Bartell, L.S. Diffraction studies of clusters generated in supersonic flow. Chem. Rev. 1986, 86, 491-504. 

Craciun R, Long RT, Dixon DA, Christe KO (2010) Electron affinities, fluoride affinities, and heats of formarion of the second row transition metal hexafluorides MFg (M = Mo, Tc, Ru, Rh, Pd, Ag). J Phys Chem A114 7571-7582... 

Craciun R, Picone D, Long RT et al (2010) Third row transition metal hexafluorides, extraordinary oxidizers, and Lewis acids electron affinities, fluoride affinities, and heats of formation ofWFe, ReFe, OsFe, IrFe, PtFe, and AuFe. Inorg Chem 49 1056-1070... 

M.J. Molski and K. Seppelt (2009) Dalton Trans., p. 3379 - The transition metal hexafluorides . 

Cady, G. H., and Hargreaves, G. B., The Vapor Pressure of Some Heavy Transition Metal Hexafluorides, / Chem. Soc., 1563,1578,1961. 

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