| Revision as of 16:35, 5 February 2011 editLuckas-bot (talk | contribs)929,662 editsm r2.7.1) (robot Adding: nl:Technetium(VI)fluoride← Previous edit |
Latest revision as of 07:36, 19 May 2024 edit undoBeland (talk | contribs)Autopatrolled, Administrators236,908 editsm change U+00B5 to U+03BC (μ) per Unicode standard and MOS:NUM#Specific units - see Unicode compatibility characters (via WP:JWB) |
| (47 intermediate revisions by 29 users not shown) |
| Line 1: |
Line 1: |
|
{{chembox |
|
{{chembox |
|
|
| verifiedrevid = 412172680 |
|
| Name = Technetium(VI) fluoride |
|
|
| ImageFile = Technetium-hexafluoride-2D.png |
|
| Name = Technetium(VI) fluoride |
|
|
| ImageFile = Technetium-hexafluoride-2D.png |
|
| ImageSize = 120 |
|
|
| ImageName = |
|
| ImageSize = 120 |
|
|
| ImageName = |
|
| OtherNames = |
|
| OtherNames = |
|
| Section1 = {{Chembox Identifiers |
|
|Section1={{Chembox Identifiers |
| ⚫ |
| CASNo = 13842-93-8 |
|
|
|
| CASNo_Ref = {{cascite|correct|??}} |
|
⚫ |
| CASNo = 13842-93-8 |
|
|
| ChemSpiderID = 57450770 |
|
|
| SMILES = F(F)(F)(F)(F)F |
|
|
| PubChem = 57470148 |
|
|
| StdInChI=1S/6FH.Tc/h6*1H;/q;;;;;;+6/p-6 |
|
|
| StdInChIKey = PRVOBRCYHYXCMU-UHFFFAOYSA-H |
|
}} |
|
}} |
|
| Section2 = {{Chembox Properties |
|
|Section2={{Chembox Properties |
|
| Formula = TcF<sub>6</sub> |
|
| Formula = TcF<sub>6</sub> |
|
| MolarMass = 212 g/mol (<sup>98</sup>Tc) |
|
| MolarMass = 212 g/mol (<sup>98</sup>Tc) |
|
| Appearance = yellow crystals<ref name="CRC_HANDBOOK_TcF6"/> |
|
| Appearance = golden-yellow crystals<ref name="CRC_HANDBOOK_TcF6"/> |
|
| Density = 3,58 g/cm³ (−140 °C), solid<ref name="D_BLOCK_XF6">T. Drews, J. Supeł, A. Hagenbach, K. Seppelt: "Solid State Molecular Structures of Transition Metal Hexafluorides", '']'', '''2006''', ''45 (9)'', S. 3782–3788; {{DOI|10.1021/ic052029f}}; PMID 16634614.</ref> |
|
| Density = 3,58 g/cm<sup>3</sup> (−140 °C), solid<ref name="D_BLOCK_XF6">{{cite journal | last1 = Drews | first1 = T. | last2 = Supeł | first2 = J. | last3 = Hagenbach | first3 = A. | last4 = Seppelt | first4 = K. | year = 2006 | title = Solid State Molecular Structures of Transition Metal Hexafluorides | journal = ] | volume = 45 | issue = 9| pages = 3782–3788 | doi = 10.1021/ic052029f | pmid = 16634614 }}</ref> |
|
|
| MeltingPtC = 37.4 |
|
| MeltingPt = 37.4 °C<ref name="CRC_HANDBOOK_TcF6">'']'', 90. Ed., CRC Press, Boca Raton, Florida, 2009, ISBN 978-1-4200-9084-0, Section 4, ''Physical Constants of Inorganic Compounds'', p. 4-93.</ref> |
|
| MeltingPt_ref = <ref name="CRC_HANDBOOK_TcF6">'']'', 90th Edition, CRC Press, Boca Raton, Florida, 2009, {{ISBN|978-1-4200-9084-0}}, Section 4, ''Physical Constants of Inorganic Compounds'', p. 4-93.</ref> |
| ⚫ |
| BoilingPt = 55.3 °C<ref name="CRC_HANDBOOK_TcF6"/> |
|
|
|
| BoilingPtC = 55.3 |
|
⚫ |
| BoilingPt_ref = <ref name="CRC_HANDBOOK_TcF6"/> |
|
}} |
|
}} |
|
| Section3 = {{Chembox Structure |
|
|Section3={{Chembox Structure |
|
| CrystalStruct = cubic |
|
| CrystalStruct = cubic |
|
}}<!-- |
|
}}<!-- |
|
| ] |
|
| ] |
| Line 23: |
Line 32: |
|
|- |
|
|- |
|
--> |
|
--> |
|
| Section7 = {{Chembox Hazards |
|
|Section7={{Chembox Hazards |
|
| EUClass = not listed |
|
|
}} |
|
}} |
|
}} |
|
}} |
|
|
|
|
|
'''Technetium(VI) fluoride''' (]]) is a yellow ] with a low ]. It was first identified in 1961.<ref name = "selig1">{{cite journal| title = The Preparation and Properties of TcF<sub>6</sub> | author = Selig, H.; Chernick, C.L.; Malm, J.G. | year = 1961 | journal = J. Inorg. & Nuclear Chem.| volume = 19 | issue= 3–4 | page =377–381}}</ref> In this compound, technetium has an ] of +6, the highest oxidation state found in the technetium ]s. The other such compound is ], TcCl<sub>6</sub>. In this respect, technetium differs from rhenium which forms a heptafluoride, ].<ref>{{Greenwood&Earnshaw}}</ref> |
|
'''Technetium hexafluoride''' or '''technetium(VI) fluoride''' (]]) is a yellow ] with a low ]. It was first identified in 1961.<ref name = "selig1">{{cite journal| title = The Preparation and Properties of TcF<sub>6</sub> |author1=Selig, H. |author2=Chernick, C.L. |author3=Malm, J.G. | year = 1961 | journal = Journal of Inorganic and Nuclear Chemistry | volume = 19 | issue= 3–4 | pages =377–381 | doi=10.1016/0022-1902(61)80132-2 }}</ref> In this compound, technetium has an ] of +6, the highest oxidation state found in the technetium ]s. In this respect, technetium differs from rhenium, which forms a heptafluoride, ].<ref>{{Greenwood&Earnshaw}}</ref> Technetium hexafluoride occurs as an impurity in ], as technetium is a ] of ] (] in ], possible contamination from ] inside the reactor in ]). The fact that the boiling point of the hexafluorides of uranium and technetium are very close to each other presents a problem in using ] in ]. |
|
|
|
|
|
== Preparation == |
|
== Preparation == |
|
Technetium hexafluoride is prepared by heating the metal in excess of F<sub>2</sub> at 400 °C.<ref name = "selig1"/> |
|
Technetium hexafluoride is prepared by heating technetium metal with an excess of F<sub>2</sub> at 400 °C.<ref name = "selig1"/> |
|
|
|
|
|
:Tc + 3 {{chem|F|2}} → {{chem|TcF|6}} |
|
:Tc + 3 {{chem|F|2}} → {{chem|TcF|6}} |
|
|
|
|
|
== Properties == |
|
== Description == |
|
|
Technetium hexafluoride is a golden-yellow solid at room temperature. Its melting point is 37.4 °C and its boiling point is 55.3 °C.<ref name="CRC_HANDBOOK_TcF6"/> |
| ⚫ |
TcF<sub>6</sub> is ], as shown by ] and ].<ref>{{cite journal| title = Vibrational Spectra of MoF<sub>6</sub> and TcF<sub>6</sub> | author = Howard H. Claassen, Henry Selig, and John G. Malm | journal = J. Chem. Phys. | volume = 36 | issue = 11 | page = 2888–2890 | year = 1962 |doi = 10.1063/1.1732396}}</ref><ref>{{cite journal| title = Raman Spectra of MoF<sub>6</sub>, TcF<sub>6</sub>, ReF<sub>6</sub>, UF<sub>6</sub>, SF<sub>6</sub>, SeF<sub>6</sub>, and TeF<sub>6</sub> in the Vapor State | author = Howard H. Claassen, Gordon L. Goodman, John H. Holloway, and Henry Selig | journal = J. Chem. Phys. | volume = 53 | issue = 1 | page = 341–348 | year= 1970 | doi=10.1063/1.1673786}}</ref> Its low-temperature ] form converts to the higher symmetry ] form at room temperature, like other metal hexafluorides such as RhF<sub>6</sub> and OsF<sub>6</sub>.<ref>{{cite journal| title =X-Ray Diffraction Studies of Some Transition Metal Hexafluorides | author = Siegel S and Northrop D A | journal = Inorg. Chem. | volume = 5 | issue = 12 | page = 2187–2188 | doi =10.1021/ic50046a025| year =1966}}</ref> Preliminary measurements of ] yield a value of 0.45 ], which is lower than expected for a d<sup>1</sup> octahedral compound.<ref>{{cite journal| title = Magnetic Susceptibility of ReF<sub>6</sub> | author = Selig, H; Cafasso, F A.; Gruen, D M.; Malm, J G. | journal = Journal of Chemical Physics | volume = 36 | issue = 12 | page = 3440–3444 | doi =10.1063/1.1732477| year = 1962}}</ref> |
|
|
|
|
|
|
|
Technetium hexafluoride undergoes a solid ] at −4.54 °C. Above this temperature (measured at 10 °C), the solid structure is ]. ] are ''a'' = 6.16 Å. There are two ]s (in this case, discrete molecules) per ], giving a density of 3.02 g·cm<sup>−3</sup>. Below this temperature (measured at −19 °C), the solid structure is ] space group ''Pnma''. ] are ''a'' = 9.55 ], ''b'' = 8.74 Å, and ''c'' = 5.02 Å. There are four ]s (in this case, discrete molecules) per ], giving a density of 3.38 g·cm<sup>−3</sup>. At −140 °C, the solid structure is still orthothombic, but the lattice parameters are now ''a'' = 9.360 ], ''b'' = 8.517 Å, and ''c'' = 4.934 Å, giving a density of 3.58 g·cm<sup>−3</sup>.<ref name="D_BLOCK_XF6"/> |
|
TcF<sub>6</sub> reacts with alkaline ]s in ] (IF<sub>5</sub>) solution to form hexafluorotechnetates.<ref>{{cite journal| title = New Fluorine Compounds of Technetium | journal = A. J. Edwards, D. Hugill & R. D. Peacock | year = 1963| volume = 200| page = 672| doi =10.1038/200672a0| last1 = Edwards| first1 = A. J.| last2 = Hugill| first2 = D.| last3 = Peacock| first3 = R. D.}}</ref><ref>{{cite journal| title = Some quinquevalent fluorotechnetates | author = D. Hugill and R. D. Peacock | journal =J. Chem. Soc. A | year = 1966 | page = 1339–1341 |doi = 10.1039/J19660001339}}</ref> |
|
|
|
|
|
|
|
The TcF<sub>6</sub> molecule itself (the form important for the liquid or gas phase) has ], which has point group ('']''). The Tc–F ] is 1.812 Å.<ref name="D_BLOCK_XF6"/> Its ] has been measured to be 0.45 ].<ref>{{cite journal |last1=Selig |first1=H. |last2=Cafasso |first2=F. A. |last3=Gruen |first3=D. M. |author3-link=Dieter M. Gruen |last4=Malm |first4=J. G. |year=1962 |title=Magnetic Susceptibility of ReF<sub>6</sub> |journal=] |volume=36 |issue=12 |pages= 3440|doi=10.1063/1.1732477|bibcode=1962JChPh..36.3440S }}</ref> |
|
TcF<sub>6</sub> disproportionates on ] with aqueous ] to form a black precipitate of ].<ref name = "selig1" /> |
|
|
|
|
|
|
|
== Properties == |
|
In ] solution, TcF<sub>6</sub> reacts with ] to yield N<sub>2</sub>H<sub>6</sub>TcF<sub>6</sub> or N<sub>2</sub>H<sub>6</sub>(TcF<sub>6</sub>)<sub>2</sub>.<ref>{{cite journal| title = Hydrazinium(+2) Hexafluorometalates(IV) and -(V) in the 4d and 5d Transition Series | author = Frlec B, Selig H, and Hyman H.H | journal = Inorg Chem | volume = 6 | issue = 10 | year =1967 | page = 1775–1783 | doi =10.1021/ic50056a004}}</ref> |
|
|
|
|
|
|
=== Physical === |
|
⚫ |
TcF<sub>6</sub> is ], as shown by ] and ].<ref>{{cite journal| title = Vibrational Spectra of MoF<sub>6</sub> and TcF<sub>6</sub> |author1=Howard H. Claassen |author2=Henry Selig |author3=John G. Malm |name-list-style=amp | journal = Journal of Chemical Physics | volume = 36 | issue = 11 | pages = 2888–2890 | year = 1962 |doi = 10.1063/1.1732396|bibcode=1962JChPh..36.2888C }}</ref><ref>{{cite journal| title = Raman Spectra of MoF<sub>6</sub>, TcF<sub>6</sub>, ReF<sub>6</sub>, UF<sub>6</sub>, SF<sub>6</sub>, SeF<sub>6</sub>, and TeF<sub>6</sub> in the Vapor State |author1=Howard H. Claassen |author2=Gordon L. Goodman |author3=John H. Holloway |author4=Henry Selig |name-list-style=amp | journal = Journal of Chemical Physics | volume = 53 | issue = 1 | pages = 341–348 | year= 1970 | doi=10.1063/1.1673786|bibcode=1970JChPh..53..341C }}</ref> Its low-temperature ] form converts to the higher symmetry ] form at room temperature, like other metal hexafluorides such as RhF<sub>6</sub> and OsF<sub>6</sub>.<ref>{{cite journal| title =X-Ray Diffraction Studies of Some Transition Metal Hexafluorides |vauthors=Siegel S, Northrop DA | journal = Inorganic Chemistry | volume = 5 | issue = 12 | pages = 2187–2188 | doi =10.1021/ic50046a025| year =1966}}</ref> Preliminary measurements of ] yield a value of 0.45 ], which is lower than expected for a d<sup>1</sup> octahedral compound.<ref>{{cite journal| title = Magnetic Susceptibility of ReF<sub>6</sub> |author1=Selig, H |author2=Cafasso, F A. |author3=Gruen, D M. |author4=Malm, J G. | journal = Journal of Chemical Physics | volume = 36 | issue = 12 | pages = 3440–3444 | doi =10.1063/1.1732477| year = 1962|bibcode=1962JChPh..36.3440S }}</ref> |
|
|
|
|
|
=== Chemical === |
|
|
TcF<sub>6</sub> reacts with alkaline ]s in ] (IF<sub>5</sub>) solution to form hexafluorotechnetates.<ref>{{cite journal| title = New Fluorine Compounds of Technetium | journal = Nature| year = 1963| volume = 200| page = 672| doi =10.1038/200672a0| last1 = Edwards| first1 = A. J.| last2 = Hugill| first2 = D.| last3 = Peacock| first3 = R. D.| issue=4907| bibcode = 1963Natur.200..672E| s2cid = 4259399| doi-access = free}}</ref><ref>{{cite journal| title = Some quinquevalent fluorotechnetates |author1=D. Hugill |author2=R. D. Peacock |name-list-style=amp | journal =Journal of the Chemical Society A| year = 1966 | pages = 1339–1341 |doi = 10.1039/J19660001339}}</ref> TcF<sub>6</sub> disproportionates on ] with aqueous ] to form a black precipitate of ].<ref name = "selig1" /> In ] solution, TcF<sub>6</sub> reacts with ] to yield N<sub>2</sub>H<sub>6</sub>TcF<sub>6</sub> or N<sub>2</sub>H<sub>6</sub>(TcF<sub>6</sub>)<sub>2</sub>.<ref>{{cite journal| title = Hydrazinium(+2) Hexafluorometalates(IV) and -(V) in the 4d and 5d Transition Series |author1=Frlec B |author2=Selig H |author3=Hyman H.H |name-list-style=amp | journal = Inorganic Chemistry | volume = 6 | issue = 10 | year =1967 | pages = 1775–1783 | doi =10.1021/ic50056a004}}</ref> |
|
|
|
|
|
== References == |
|
== References == |
|
{{reflist}} |
|
{{reflist}} |
|
|
{{Hexafluorides}} |
|
|
{{Technetium compounds}} |
|
|
{{fluorine compounds}} |
|
|
|
|
| ⚫ |
] |
|
|
] |
|
] |
|
⚫ |
] |
|
|
|
|
|
] |
|
] |
|
|
] |
|