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Dichlorine heptoxide information


Dichlorine heptoxide
Names
IUPAC name
Dichlorine heptoxide
Other names
Chlorine(VII) oxide; Perchloric anhydride; (Perchloryloxy)chlorane trioxide
Identifiers
CAS Number
  • 12015-53-1 checkY
3D model (JSmol)
  • Interactive image
ChEBI
  • CHEBI:52356 checkY
ChemSpider
  • 109884 checkY
PubChem CID
  • 123272
UNII
  • 22MM1X86NB checkY
CompTox Dashboard (EPA)
  • DTXSID90152704 Edit this at Wikidata
InChI
  • InChI=1S/Cl2O7/c3-1(4,5)9-2(6,7)8 checkY
    Key: SCDFUIZLRPEIIH-UHFFFAOYSA-N checkY
  • InChI=1.001/Cl2O7/c3-1(4,5)9-2(6,7)8
    Key: SCDFUIZLRPEIIH-UHFFFAOYAG
SMILES
  • O=Cl(=O)(=O)OCl(=O)(=O)=O
Properties
Chemical formula
 Cl2O7
Molar mass 182.901 g/mol
Appearance colorless liquid, colorless gas
Density 1.9 g/cm3
Melting point −91.57 °C (−132.83 °F; 181.58 K)
Boiling point 82.07 °C (179.73 °F; 355.22 K)
Solubility in water
 hydrolyzes to form perchloric acid
Thermochemistry
Std enthalpy of
formation (ΔfH⦵298)
 275.7 kJ/mol
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 oxidizer, contact explosive[1]
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasFlammability 0: Will not burn. E.g. waterInstability 3: Capable of detonation or explosive decomposition but requires a strong initiating source, must be heated under confinement before initiation, reacts explosively with water, or will detonate if severely shocked. E.g. hydrogen peroxideSpecial hazard OX: Oxidizer. E.g. potassium perchlorate
3
0
3
OX
Related compounds
Related compounds
 Manganese heptoxide
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

Dichlorine heptoxide is the chemical compound with the formula Cl2O7. This chlorine oxide is the anhydride of perchloric acid. It is produced by the careful distillation of perchloric acid in the presence of the dehydrating agent phosphorus pentoxide:[1]

2 HClO4 + P4O10 → Cl2O7 + H2P4O11

The chlorine(VII) oxide can be distilled off from the mixture.

It may also be formed by illumination of mixtures of chlorine and ozone with blue light.[2] It slowly hydrolyzes back to perchloric acid.

  1. ^ a b Holleman, Arnold F.; Wiberg, Egon (2001). Inorganic chemistry. Translated by Mary Eagleson; William Brewer. San Diego: Academic Press. p. 464. ISBN 0-12-352651-5.
  2. ^ Byrns, A. C.; Rollefson, G. K. (1934). "The Formation of Chlorine Heptoxide on Illumination of Mixtures of Chlorine and Ozone". Journal of the American Chemical Society. 56 (5): 1250–1251. doi:10.1021/ja01320a506.

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Dichlorine heptoxide

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Dichlorine heptoxide is the chemical compound with the formula Cl2O7. This chlorine oxide is the anhydride of perchloric acid. It is produced by the careful...

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Dichlorine pentoxide

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the chlorous acid/perchloric acid mixed anhydride. Dichlorine heptoxide Dichlorine trioxide Dichlorine monoxide Chlorine dioxide Li, Wai-Kee; Lau, Kai-Chung;...

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Chlorine oxide

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Cl2O6 or [ClO2]+[ClO4]−, chlorine (V,VII) oxide dichlorine heptoxide, Cl2O7, chlorine (VII) oxide dichlorine octoxide, chlorine (VII) oxide peroxide or dimer...

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Chlorine

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with anhydrous hydrogen fluoride does not proceed to completion. Dichlorine heptoxide (Cl2O7) is the anhydride of perchloric acid (HClO4) and can readily...

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List of inorganic compounds

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chloride – ClCN Dichlorine dioxide – Cl2O2 Dichlorine heptaoxide – Cl2O7 Dichlorine heptoxide – Cl2O7 Dichlorine hexoxide – Cl2O6 Dichlorine monoxide – Cl2O...

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Perchloric acid

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from the air. Dehydration of perchloric acid gives the anhydride dichlorine heptoxide: 2 HClO4 + P4O10 → Cl2O7 + H2P4O11 Perchloric acid is mainly produced...

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Nitrosyl perchlorate

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sulfuric acid. A much purer product can be produced by reacting dichlorine heptoxide with anhydrous nitric acid. The structure of NOClO4 has not been...

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Chlorine perchlorate

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decomposes at room temperature to give O2 (oxygen), Cl2 (chlorine) and Cl2O6 (dichlorine hexoxide): 2ClOClO3 → O2 + Cl2 + Cl2O6 Chlorine perchlorate reacts with...

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Zirconium perchlorate

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equilibrium with dichlorine heptoxide, hydronium ions and perchlorate ions. This side product can be minimised by adding more dichlorine heptoxide or doing the...

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Niobium perchlorate

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decomposes at 70 °C (343 K; 158 °F) to niobyl perchlorate, releasing dichlorine heptoxide: Nb(ClO4)5 → NbO(ClO4)3 + Cl2O7 Niobyl perchlorate further decomposes...

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Perchloratoborate

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perchlorate, and boron trioxide as a solid residue, and gas containing dichlorine heptoxide, chlorine dioxide, chlorine, and oxygen. 2 M[B(ClO4)4] → 2 MClO4...

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Chlorine tetroxide

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rays at 77 K. It is a reaction intermediate of the decomposition of dichlorine heptoxide.[citation needed] The electron affinity energy of chlorine tetroxide...

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Vanadyl perchlorate

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Vanadyl perchlorate can be made by reacting vanadium pentoxide with dichlorine heptoxide at 5 °C. It is purified by distillation under a vacuum and recrystallisation...

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Titanium perchlorate

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tetrachloride with perchloric acid enriched in dichlorine heptoxide. Another way uses titanium tetrachloride with dichlorine hexoxide. This forms a complex with...

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