Technetium(VII) oxide

Technetium(VII) oxide
IUPAC name

Technetium(VII) oxide
Other names

Technetium heptoxide
Properties
Molecular formula Tc2O7
Appearance yellow solid
Melting point

119.5 °C
Boiling point

310.6 °C
Solubility in water hydrolysis to HTcO4
Hazards
Main hazards radioactive
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
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 O-Tc-O 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

References

  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.