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Perrhenic acid

Perrhenic acid
Names IUPAC name
Perrhenic acid
Systematic IUPAC name
[Diaquatrioxidorhenium(VII)]-μ-oxido-[trioxidorhenium(VII)]
Other names
Hydrated rhenium(VII) oxide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard100.033.968EC Number
  • 237-380-4
RTECS number
  • TT4550000
  • InChI=1S/2H2O.7O.2Re/h2*1H2;;;;;;;;;
    Key: JOTGKJVGIIKFIQ-UHFFFAOYSA-N
  • InChI=1/2H2O.7O.2Re/h2*1H2;;;;;;;;;/rH4O9Re2/c1-10(2,3)9-11(4,5,6,7)8/h4-5H2
    Key: JOTGKJVGIIKFIQ-SEUCOXMMAB
  • aqueous: [OH2+][Re-2](=O)(=O)(=O)([OH2+])O[Re](=O)(=O)=O
  • gaseous: O=[Re](=O)(=O)O
Properties H4Re2O9 (solid)
HReO4 (gas) Molar mass251.2055 g/mol Appearance Pale yellow solid Boiling pointsublimes Soluble Acidity (pKa) −1.25 Conjugate basePerrhenateStructure octahedral-tetrahedral (solid)
tetrahedral (gas) Hazards Occupational safety and health (OHS/OSH):
Main hazards
Corrosive GHS labelling: DangerH302, H314, H332P260, P264, P270, P271, P280, P301+P312, P301+P330+P331, P303+P361+P353, P304+P312, P304+P340, P305+P351+P338, P310, P312, P321, P330, P363, P405, P501NFPA 704 (fire diamond)
3
Flash pointNon-flammable Related compounds
Related compounds
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Perrhenic acid is the chemical compound with the formula Re2O7(H2O)2. It is obtained by evaporating aqueous solutions of Re2O7. Conventionally, perrhenic acid is considered to have the formula HReO4, and a species of this formula forms when rhenium(VII) oxide sublimes in the presence of water or steam. When a solution of Re2O7 is kept for a period of months, it breaks down and crystals of HReO4·H2O are formed, which contain tetrahedral ReO−4. For most purposes, perrhenic acid and rhenium(VII) oxide are used interchangeably. Rhenium can be dissolved in nitric or concentrated sulfuric acid to produce perrhenic acid.

Wikipedia source