Technetium(VII) oxide
From Infogalactic: the planetary knowledge core
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Names | |
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IUPAC name
Technetium(VII) oxide
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Other names
Technetium heptoxide
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Identifiers | |
12165-21-8 | |
Jmol 3D model | Interactive image |
PubChem | 22227441 |
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Properties | |
Tc2O7 | |
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 | |
Structure | |
orthrhombic | |
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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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