Technetium oxide is the chemical compound

Chemical compound

A chemical compound is a pure chemical substance consisting of two or more different chemical elements that can be separated into simpler substances by chemical reactions. Chemical compounds have a unique and defined chemical structure; they consist of a fixed ratio of atoms that are held together...

 with the formula

Chemical formula

A chemical formula or molecular formula is a way of expressing information about the atoms that constitute a particular chemical compound....

 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

Manganese(VII) oxide

Manganese oxide is an inorganic compound with the formula Mn2O7. This volatile liquid is highly reactive and more often discussed than intentionally prepared. It is a dangerous oxidizer and was first described in 1860.- Properties :...

. 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

Technetium

Technetium is the chemical element with atomic number 43 and symbol Tc. It is the lowest atomic number element without any stable isotopes; every form of it is radioactive. Nearly all technetium is produced synthetically and only minute amounts are found in nature...

 at 450-500 °C:

2 Tc + 3.5 O₂ → Tc₂O₇

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

Sodium pertechnetate

Sodium pertechnetate is the inorganic compound with the formula NaTcO4. This colourless salt consists of the anion [TcO4]−. The radioactive 99mTcO4− anion is an important radiopharmaceutical for diagnostic use...

:

Tc₂O₇ + 2 NaOH → 2 NaTcO₄ + H₂O