Technetium(VII) oxide

Technetium(VII) oxide
Structural formula of technetium(VII) oxide.
Unit cell of technetium(VII) oxide.
Names
IUPAC name
Technetium(VII) oxide
Other names
Technetium heptoxide
Identifiers
3D model (JSmol)
  • InChI=1S/7O.2Tc/q7*-2;2*+7
  • O=[Tc](=O)(=O)O[Tc](=O)(=O)=O
Properties
Tc2O7
Molar mass 307.810 g/mol
Appearance light yellow solid
Density 3.5 g/cm3
Melting point 119.5 °C (247.1 °F; 392.6 K)
Boiling point 310.6 °C (591.1 °F; 583.8 K)
hydrolysis to HTcO4
−40.0·10−6 cm3/mol
Structure
Primitive orthorhombic
Pbca, No. 61
a = 1375.6 pm, b = 743.9 pm, c = 561.7 pm
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 radioactive
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references

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°.

Technetium(VII) oxide is prepared by the oxidation of technetium at 450–500 °C:

4 Tc + 7 O2 → 2 Tc2O7

It is the anhydride of pertechnetic acid and the precursor to sodium pertechnetate:

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