Technetium(VII) oxide
| Technetium(VII) oxide | |
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Technetium(VII) oxide |
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Other names
Technetium heptoxide |
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| Identifiers | |
| CAS number | 12165-21-8  |
| PubChem | 22227441 |
| Jmol-3D images | Image 1 |
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| Properties | |
| Molecular formula | Tc2O7 |
| Molar mass | 307.810 g/mol |
| Appearance | yellow solid |
| Melting point |
119.5 °C |
| Boiling point |
310.6 °C |
| Solubility in water | hydrolysis to HTcO4 |
| Hazards | |
| Main hazards | radioactive |
 (verify) (what is:  / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 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
References
- ^ Krebs, B. (1969). "Technetium(VII)-oxid: Ein Übergangsmetalloxid mit Molekülstruktur im festen Zustand". Angewandte Chemie 81 (9): 328–329. doi:10.1002/ange.19690810905.
- ^ 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.
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