Formula Tc2O7 Molar mass 307.81 g/mol Melting point 119.5 °C Pubchem 22227441 | Density 3.5 g/cm³ Boiling point 310.6 °C Appearance light yellow solid | |
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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°.
Technetium(VII) oxide is prepared by the oxidation of technetium at 450–500 °C:
2 Tc + 3.5 O2 → Tc2O7It is the anhydride of pertechnic acid and the precursor to sodium pertechnetate:
Tc2O7 + 2 NaOH → 2 NaTcO4 + H2OReferences
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