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| Names | |
|---|---|
| IUPAC name Technetium(VII) oxide | |
| Other names Technetium heptoxide | |
| Identifiers | |
| CompTox Dashboard (EPA) | |
| Properties | |
| Chemical formula | Tc2O7 |
| Appearance | yellow solid |
| Melting point | 119.5 °C |
| Boiling point | 310.6 °C |
| Solubility in water | hydrolysis to HTcO4 |
| 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 , 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°
Technetium(VII) oxide is prepared by the oxidation of technetium at 450-500 °C:
- 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
- Krebs, B. (1969). "Technetium(VII)-oxid: Ein Übergangsmetalloxid mit Molekülstruktur im festen Zustand". Angewandte Chemie. 81: 328–329. doi:10.1002/ange.19690810905.
- Herrell, A. Y.; Busey, R. H.; Gayer, K. H. (1977). Technetium(VII) Oxide, in Inorganic Syntheses. Vol. XVII. pp. 155–158. ISBN 0-07-044327-0.
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