| 词条 | Technetium(VII) oxide |
| 释义 |
| Verifiedfields = changed | Watchedfields = changed | verifiedrevid = 407107879 | ImageFile = Tc2O7.png | ImageSize = | ImageCaption = Structural formula of technetium(VII) oxide. | ImageFile1 = Technetium(VII)-oxid.png | ImageSize1 = 240px | ImageAlt1 = Unit cell of technetium(VII) oxide under standard conditions. | ImageCaption1 = Unit cell of technetium(VII) oxide. | IUPACName = Technetium(VII) oxide | OtherNames = Technetium heptoxide |Section1={{Chembox Identifiers | CASNo_Ref = {{cascite|changed|??}} | CASNo = 12165-21-8 | PubChem = 22227441 | InChI = 1S/7O.2Tc/q7*-2;2*+7 | SMILES = [O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Tc+7].[Tc+7] |Section2={{Chembox Properties | Formula = Tc2O7 | MolarMass = 307.810 g/mol | Appearance = light yellow solid | Density = 3.5 g/cm3 | MeltingPtC = 119.5 | BoilingPtC = 310.6 | Solubility = hydrolysis to HTcO4 | MagSus = −40.0·10−6 cm3/mol |Section3={{Chembox Structure | Structure_ref = [1] | CrystalStruct = Primitive orthorhombic | LattConst_a = 1375.6 pm | LattConst_b = 743.9 pm | LattConst_c = 561.7 pm | LattConst_ref = [1] | SpaceGroup = Pbca, No. 61 |Section7={{Chembox Hazards | MainHazards = radioactive | FlashPt = | AutoignitionPt = }}Technetium(VII) oxide is the chemical compound with the formula Tc2O7. This yellow volatile solid is a rare example of a molecular binary metal oxide, the other examples being RuO4, OsO4, and the unstable Mn2O7. 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 Tc−O−Tc angle is 180°.[2] Technetium(VII) oxide is prepared by the oxidation of technetium at 450–500 °C:[3] 4 Tc + 7 O2 → 2 Tc2O7 It is the anhydride of pertechnic acid and the precursor to sodium pertechnetate: Tc2O7 + 2 NaOH → 2 NaTcO4 + H2O References1. ^1 {{DOI|10.1002/zaac.19713800205}} {{Technetium compounds}}{{Oxides}}2. ^{{cite journal| author = Krebs, B. | 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}} 3. ^{{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}} 2 : Technetium compounds|Oxides |
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