Technetium(VII) oxide

Technetium(VII) oxide
	; Structural formula of technetium(VII) oxide.
	; Unit cell of technetium(VII) oxide.
Names
	IUPAC name Technetium(VII) oxide
	Other names Technetium heptoxide
Identifiers
CAS Number	12165-21-8 ;
3D model (JSmol)	Interactive image;
PubChem CID	22227441;
CompTox Dashboard (EPA)	DTXSID70153330 ;
	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/cm3
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
Magnetic susceptibility (χ)	−40.0·10−6 cm3/mol
Structure
Crystal structure	Primitive orthorhombic
Space group	Pbca, No. 61
Lattice constant	a = 1375.6 pm, b = 743.9 pm, c = 561.7 pm
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	radioactive
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) 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°.

Technetium(VII) oxide is prepared by the oxidation of technetium at 450–500 °C:

4 Tc + 7 O₂ → 2 Tc₂O₇

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

Tc₂O₇ + 2 H₂O → 2 HTcO₄

Tc₂O₇ + 2 NaOH → 2 NaTcO₄ + H₂O

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