Technetium(VII) oxide

Technetium(VII) oxide
IUPAC name Technetium(VII) oxide
Other names Technetium heptoxide
Identifiers
CAS number	12165-21-8 Y
PubChem	22227441
	Jmol-3D images	{{#if:[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Tc+7].[Tc+7]|Image 1
SMILES [O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Tc+7].[Tc+7]
InChI InChI=1S/7O.2Tc/q7*-2;2*+7
Properties
Molecular formula	Tc2O7
Molar mass	307.810 g/mol
Appearance	yellow solid
Melting point	119.5 °C
Boiling point	310.6 °C
Solubility in water	hydrolysis to HTcO4
Hazards
Main hazards	radioactive
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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.