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]|Technetium (VII) oxide containing ]]]


'''Technetium(VII) oxide''' is the ] with the ] Tc<sub>2</sub>O<sub>7</sub>. This yellow volatile solid is a rare example of a molecular binary metal oxide, the other examples being ], ], and the unstable ]. It adopts a ] corner-shared bi-tetrahedral structure in which the terminal and bridging Tc&minus;O bonds are 167pm and 184 pm respectively and the Tc&minus;O&minus;Tc angle is 180°.<ref>{{cite journal|last=Krebs|first=Bernt|title = Technetium(VII)-oxid: Ein Übergangsmetalloxid mit Molekülstruktur im festen Zustand| journal = Angewandte Chemie | year = 1969 | volume = 81| issue = 9| pages = 328–329| doi = 10.1002/ange.19690810905|bibcode=1969AngCh..81..328K}}</ref> '''Technetium(VII) oxide''' is the ] with the ] Tc<sub>2</sub>O<sub>7</sub>. This yellow volatile solid is a rare example of a molecular binary metal oxide, the other examples being ], ], and the unstable ]. It adopts a ] corner-shared bi-tetrahedral structure in which the terminal and bridging Tc&minus;O bonds are 167pm and 184 pm respectively and the Tc&minus;O&minus;Tc angle is 180°.<ref>{{cite journal|last=Krebs|first=Bernt|title = Technetium(VII)-oxid: Ein Übergangsmetalloxid mit Molekülstruktur im festen Zustand| journal = Angewandte Chemie | year = 1969 | volume = 81| issue = 9| pages = 328–329| doi = 10.1002/ange.19690810905|bibcode=1969AngCh..81..328K}}</ref>

Latest revision as of 15:18, 16 July 2024

Technetium(VII) oxide

Structural formula of technetium(VII) oxide.
Unit cell of technetium(VII) oxide under standard conditions.
Unit cell of technetium(VII) oxide.
Names
IUPAC name Technetium(VII) oxide
Other names Technetium heptoxide
Identifiers
CAS Number
3D model (JSmol)
PubChem CID
CompTox Dashboard (EPA)
InChI
  • InChI=1S/7O.2Tc/q7*-2;2*+7
SMILES
  • O=(=O)(=O)O(=O)(=O)=O
Properties
Chemical formula Tc2O7
Molar mass 307.810 g/mol
Appearance light yellow solid
Density 3.5 g/cm
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 cm/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 , 100 kPa). ☒N verify (what is  ?) Infobox references
Chemical compound
Technetium (VII) oxide containing Technetium-99
Technetium (VII) oxide containing Technetium-99

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

References

  1. ^ Krebs, Bernt (1971). "Technetium(VII)-oxid: Ein Übergangsmetalloxid mit Molekülstruktur im festen Zustand". Zeitschrift für anorganische und allgemeine Chemie. 380 (2): 146–159. doi:10.1002/zaac.19713800205.
  2. Krebs, Bernt (1969). "Technetium(VII)-oxid: Ein Übergangsmetalloxid mit Molekülstruktur im festen Zustand". Angewandte Chemie. 81 (9): 328–329. Bibcode:1969AngCh..81..328K. doi:10.1002/ange.19690810905.
  3. Herrell, A. Y.; Busey, R. H.; Gayer, K. H. (1977). Technetium(VII) Oxide, in Inorganic Syntheses. Vol. XVII. pp. 155–158. doi:10.1002/9780470132487.ch41. ISBN 0-07-044327-0.
Technetium compounds
Technetium(II)
Technetium(III)
Technetium(IV)
Technetium(V)
Technetium(VI)
Technetium(VII)
Oxides
Mixed oxidation states
+1 oxidation state
+2 oxidation state
+3 oxidation state
+4 oxidation state
+5 oxidation state
+6 oxidation state
+7 oxidation state
+8 oxidation state
Related
Oxides are sorted by oxidation state. Category:Oxides
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