Technetium(VII) oxide

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Technetium(VII) oxide
IUPAC name
Technetium(VII) oxide
Other names
Technetium heptoxide
12165-21-8 N
Jmol 3D model Interactive image
PubChem 22227441
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
Vapor pressure {{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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°.[1]

Technetium(VII) oxide is prepared by the oxidation of technetium at 450–500 °C:[2]

2 Tc + 3.5 O2 → Tc2O7

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

Tc2O7 + 2 NaOH → 2 NaTcO4 + H2O


  1. Krebs, B. (1969). "Technetium(VII)-oxid: Ein Übergangsmetalloxid mit Molekülstruktur im festen Zustand". Angewandte Chemie. 81 (9): 328–329. doi:10.1002/ange.19690810905. 
  2. Herrell, A. Y.; Busey, R. H.; Gayer, K. H. (1977). Technetium(VII) Oxide, in Inorganic Syntheses. XVII. pp. 155–158. ISBN 0-07-044327-0.