Technetium(VII) oxide

Technetium(VII) oxide

Names
IUPAC name Technetium(VII) oxide
Other names Technetium heptoxide
Identifiers
CAS Number	12165-21-8
3D model (Jmol)	Interactive image
PubChem	22227441
InChI InChI=1S/7O.2Tc/q7*-2;2*+7
SMILES [O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Tc+7].[Tc+7]
Properties
Chemical formula	Tc2O7
Molar mass	307.810 g/mol
Appearance	light yellow solid
Density	3.5 g/cm^3
Melting point	119.5 °C (247.1 °F; 392.6 K)
Boiling point	310.6 °C (591.1 °F; 583.8 K)
Solubility in water	hydrolysis to HTcO4
Structure
Crystal structure	orthrhombic
Hazards
Main hazards	radioactive
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 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

1. Krebs, B. (1969). "Technetium(VII)-oxid: Ein Übergangsmetalloxid mit Molekülstruktur im festen Zustand". Angewandte Chemie. 81 (9): 328–329. doi:10.1002/ange.19690810905.
2. 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.