Technetium(VII) oxide

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 → Tc₂O₇

It is the anhydride of pertechnic acid and the precursor to sodium pertechnetate:

Tc₂O₇ + 2 NaOH → 2 NaTcO₄ + H₂O