Technetium(VI) fluoride

Technetium(VI) fluoride

Chembox new
Name = Technetium(VI) fluoride
ImageFile = Technetium-hexafluoride-2D.png ImageSize = 120
ImageName =
OtherNames =
Section1 = Chembox Identifiers
CASNo = 13842-93-8

Section2 = Chembox Properties
Formula = TcF6
MolarMass = 212 g/mol
Appearance = yellow crystals
Density = 3 g/cm³, solid
MeltingPt = 37.4°C
BoilingPt = 55.3°C

Section3 = Chembox Structure
CrystalStruct = cubic

Section7 = Chembox Hazards
EUClass = not listed

Technetium(VI) fluoride (TcF6) is a yellow low melting inorganic chemical compound. It was first identified in 1961. The preparation and properties of TcF6 Selig, H.; Chernick, C.L.; Malm, J.G. (1961) J. Inorg. & Nuclear Chem.; 19 ,377] In this compound technetium has an oxidation state of +6, and with TcCl6 has the highest oxidation state found in technetium halides. In this respect technetium differs from rhenium which forms the heptafluoride, ReF7. [Greenwood&Earnshaw]

Technetium hexafluoride is prepared by heating the metal in excess of F2 at 400°C

TcF6 is octahedral as shown by the vibrational spectra (IR and Raman) Vibrational Spectra of MoF6 and TcF6 Howard H. Claassen, Henry Selig, and John G. Malm J. Chem. Phys. 36,11, 2888 (1962); doi|10.1063/1.1732396 ] [ Raman Spectra of MoF6, TcF6, ReF6, UF6, SF6, SeF6, and TeF6 in the Vapor State Howard H. Claassen, Gordon L. Goodman, John H. Holloway, and Henry Selig J. Chem. Phys. 53, 1, 341 (1970); doi|10.1063/1.1673786] The low temperature orthorhombic form converts to the higher symmetry bcc (body centred cubic) form at room temperature, in a similar way to other hexafluorides e.g. RhF6, OsF6. [X-Ray Diffraction Studies of Some Transition Metal Hexafluorides Siegel S and Northrop D A Inorg chem 5, 12, 2187 - 2188; doi|10.1021/ic50046a025]

Preliminary measurements of magnetic moment yield a value of 0.45BM lower than expected for a d1 octahedral compound. [ Magnetic Susceptibility of ReF6 Selig, H; Cafasso, F A.; Gruen, D M.; Malm, J G. Journal of Chemical Physics, 36, 3440-3444 doi|:10.1063/1.1732477]

Alkali chlorides + TcF6 in IF5 gives hexafluorotechnetates. [ New Fluorine Compounds of Technetium A. J. Edwards, D. Hugill & R. D. Peacock Nature (1963),200, 672 ; doi|10.1038/200672a0] [ Some quinquevalent fluorotechnetates D. Hugill and R. D. Peacock J. Chem. Soc. A, 1966, 1339 - 1341, doi|10.1039/J19660001339 ]

TcF6 disproportionates on hydrolysis with aqueous NaOH to form a black precipitate of TcO2.aq

TcF6 in HF + hydrazinium fluoride gives N2H6TcF6 or N2H6(TcF6)2 [ Hydrazinium(+2) hexafluorometalates(IV) and -(V) in the 4d and 5d transition series Frlec B, Selig H, and Hyman H.H Inorg Chem Vol. 6, 10: (1967) 1775 - 1783; doi|10.1021/ic50056a004]

References


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