Technetium(VII) oxide
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| Technetium(VII) oxide | |
|---|---|
 |
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| 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 |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
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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
[edit] References
- ^ Krebs, B. Technetium(VII)-oxid: Ein Übergangsmetalloxid mit Molekülstruktur im festen Zustand" Angewandte Chemie 1969, Volume 81, pp. 328 - 329. doi:10.1002/ange.19690810905
- ^ Herrell, A. Y.; Busey, R. H.; Gayer, K. H. "Technetium(VII) Oxide" Inorganic Syntheses, 1977, volume XVII, p. 155-158. ISBN 0-07-044327-0.
