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Technetium(VII) oxide

From Wikipedia, the free encyclopedia
Technetium(VII) oxide
Structural formula of technetium(VII) oxide.
Unit cell of technetium(VII) oxide under standard conditions.
Unit cell of technetium(VII) oxide.
Names
IUPAC name
Technetium(VII) oxide
Other names
Technetium heptoxide
Identifiers
3D model (JSmol)
ChemSpider
  • Key: IOWOAQVVLHHFTL-UHFFFAOYSA-N
  • InChI=1S/7O.2Tc/q7*-2;2*+7
  • O=[Tc](=O)(=O)O[Tc](=O)(=O)=O
Properties
Tc2O7
Molar mass307.810 g/mol
Appearancelight yellow solid
Density3.5 g/cm3
Melting point119.5 °C (247.1 °F; 392.6 K)
Boiling point310.6 °C (591.1 °F; 583.8 K)
hydrolysis to HTcO4
−40.0·10−6 cm3/mol
Structure[1]
Primitive orthorhombic
Pbca, No. 61
a = 1375.6 pm,b = 743.9 pm,c = 561.7 pm[1]
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
radioactive
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa).
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Chemical compound
Technetium (VII) oxide containing Technetium-99
Technetium (VII) oxide containingTechnetium-99

Technetium(VII) oxide is thechemical compound with theformula Tc2O7. This yellow volatile solid is a rare example of a molecular binary metal oxide, the other examples beingRuO4,OsO4, and the unstableMn2O7. It adopts acentrosymmetric 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 oftechnetium at 450–500 °C:[3]

4 Tc + 7 O2 → 2 Tc2O7

It is the anhydride ofpertechnetic acid and the precursor tosodium pertechnetate:

Tc2O7 + 2 H2O → 2 HTcO4
Tc2O7 + 2 NaOH → 2 NaTcO4 + H2O

References

[edit]
  1. ^abKrebs, Bernt (1971). "Technetium(VII)-oxid: Ein Übergangsmetalloxid mit Molekülstruktur im festen Zustand".Zeitschrift für anorganische und allgemeine Chemie.380 (2):146–159.Bibcode:1971ZAACh.380..146K.doi:10.1002/zaac.19713800205.
  2. ^Krebs, Bernt (1969). "Technetium(VII)-oxid: Ein Übergangsmetalloxid mit Molekülstruktur im festen Zustand".Angewandte Chemie.81 (9):328–329.Bibcode:1969AngCh..81..328K.doi:10.1002/ange.19690810905.
  3. ^Herrell, A. Y.; Busey, R. H.; Gayer, K. H. (1977).Technetium(VII) Oxide, in Inorganic Syntheses. Vol. XVII. pp. 155–158.doi:10.1002/9780470132487.ch41.ISBN 0-07-044327-0.
Technetium(II)
Technetium(III)
Technetium(IV)
Technetium(V)
Technetium(VI)
Technetium(VII)
Mixed oxidation states
+1 oxidation state
+2 oxidation state
+3 oxidation state
+4 oxidation state
+5 oxidation state
+6 oxidation state
+7 oxidation state
+8 oxidation state
Related
Oxides are sorted byoxidation state.Category:Oxides
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