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| ImageFile = Tc2O7.png |
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| verifiedrevid = 407107879 |
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| ImageFile = Tc2O7.png |
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| ImageSize = |
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| ImageSize = |
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| ImageCaption = Structural formula of technetium(VII) oxide. |
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| ImageFile1 = Technetium(VII)-oxid.png |
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| ImageSize1 = 240px |
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| ImageAlt1 = Unit cell of technetium(VII) oxide under standard conditions. |
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| ImageCaption1 = Unit cell of technetium(VII) oxide. |
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| IUPACName = Technetium(VII) oxide |
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| IUPACName = Technetium(VII) oxide |
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| OtherNames = Technetium heptoxide |
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| OtherNames = Technetium heptoxide |
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| Section1 = {{Chembox Identifiers |
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|Section1={{Chembox Identifiers |
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| CASNo_Ref = {{cascite|changed|??}} |
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| CASNo = |
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| PubChem = |
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| CASNo = 12165-21-8 |
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| SMILES = |
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| PubChem = 22227441 |
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| InChI = 1S/7O.2Tc/q7*-2;2*+7 |
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| SMILES = O=(=O)(=O)O(=O)(=O)=O |
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| Section2 = {{Chembox Properties |
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|Section2={{Chembox Properties |
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| Formula = Tc<sub>2</sub>O<sub>7</sub> |
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| Formula = Tc<sub>2</sub>O<sub>7</sub> |
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| MolarMass = |
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| MolarMass = 307.810 g/mol |
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| Appearance = yellow solid |
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| Appearance = light yellow solid |
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| Density = |
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| Density = 3.5 g/cm<sup>3</sup> |
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| MeltingPt = 119.5 °C |
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| MeltingPtC = 119.5 |
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| BoilingPt = 310.6 °C |
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| BoilingPtC = 310.6 |
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| Solubility = hydrolysis to HTcO<sub>4</sub> |
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| Solubility = hydrolysis to HTcO<sub>4</sub> |
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| MagSus = −40.0·10<sup>−6</sup> cm<sup>3</sup>/mol |
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| Section3 = {{Chembox Hazards |
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|Section3={{Chembox Structure |
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| Structure_ref = <ref name="crystal structure" /> |
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| MainHazards = radioactive |
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| CrystalStruct = Primitive orthorhombic |
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| FlashPt = |
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| LattConst_a = 1375.6 pm |
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| Autoignition = |
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| LattConst_b = 743.9 pm |
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| LattConst_c = 561.7 pm |
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| LattConst_ref = <ref name="crystal structure">{{cite journal|last=Krebs|first=Bernt|title=Technetium(VII)-oxid: Ein Übergangsmetalloxid mit Molekülstruktur im festen Zustand|journal=Zeitschrift für anorganische und allgemeine Chemie|volume=380|year=1971|issue=2|pages=146–159|doi=10.1002/zaac.19713800205}}</ref> |
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| SpaceGroup = Pbca, No. 61 |
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|Section7={{Chembox Hazards |
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| MainHazards = radioactive |
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| FlashPt = |
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| AutoignitionPt = |
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]|Technetium (VII) oxide containing ]]] |
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Technetium(VII) oxide is the ] with the ] Tc<sub>2</sub>O<sub>7</sub>. This yellow volatile solid is a rare example of a molecular binary metal oxide, the other examples being RuO<sub>4</sub>, ], and the unstable ]. It adopts a centrosymmetric corner-shared bi-tetrahedral structure in which the terminal and bridging Tc-O bonds are 167pm and 184 pm respectively and the O-Tc-O angle is 180°<ref>{{cite journal| author = Krebs, B. | title = Technetium(VII)-oxid: Ein Übergangsmetalloxid mit Molekülstruktur im festen Zustand| journal = Angewandte Chemie | year = 1969 | volume = 81| pages = 328–329| doi = 10.1002/ange.19690810905}}</ref> |
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'''Technetium(VII) oxide''' is the ] with the ] Tc<sub>2</sub>O<sub>7</sub>. This yellow volatile solid is a rare example of a molecular binary metal oxide, the other examples being ], ], and the unstable ]. It adopts a ] corner-shared bi-tetrahedral structure in which the terminal and bridging Tc−O bonds are 167pm and 184 pm respectively and the Tc−O−Tc angle is 180°.<ref>{{cite journal|last=Krebs|first=Bernt|title = Technetium(VII)-oxid: Ein Übergangsmetalloxid mit Molekülstruktur im festen Zustand| journal = Angewandte Chemie | year = 1969 | volume = 81| issue = 9| pages = 328–329| doi = 10.1002/ange.19690810905|bibcode=1969AngCh..81..328K}}</ref> |
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Technetium(VII) oxide is prepared by the oxidation of ] at 450-500 °C:<ref>{{cite book| author = Herrell, A. Y.; Busey, R. H.; Gayer, K. H. | title = Technetium(VII) Oxide, in Inorganic Syntheses| year = 1977 | volume = XVII| pages = 155–158 | isbn = 0-07-044327-0}}</ref> |
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:2 Tc + 3.5 O<sub>2</sub> → Tc<sub>2</sub>O<sub>7</sub> |
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Technetium(VII) oxide is prepared by the oxidation of ] at 450–500 °C:<ref>{{cite book|author1=Herrell, A. Y. |author2=Busey, R. H. |author3=Gayer, K. H. | title = Technetium(VII) Oxide, in Inorganic Syntheses| year = 1977 | volume = XVII| pages = 155–158 | isbn = 0-07-044327-0|doi=10.1002/9780470132487.ch41}}</ref> |
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It is the anhydride of pertechnic acid and the precursor to ]: |
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:4 Tc + 7 O<sub>2</sub> → 2 Tc<sub>2</sub>O<sub>7</sub> |
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It is the anhydride of ] and the precursor to ]: |
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:Tc<sub>2</sub>O<sub>7</sub> + 2 H<sub>2</sub>O → 2 HTcO<sub>4</sub> |
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:Tc<sub>2</sub>O<sub>7</sub> + 2 NaOH → 2 NaTcO<sub>4</sub> + H<sub>2</sub>O |
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:Tc<sub>2</sub>O<sub>7</sub> + 2 NaOH → 2 NaTcO<sub>4</sub> + H<sub>2</sub>O |
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==References== |
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==References== |
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<references/> |
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<references/> |
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{{Technetium compounds}} |
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{{Oxides}} |
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