Potassium chlorochromate

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Potassium chlorochromate
Names
Other names
Potassium trioxochlorochromate,[1][2][3] Peligot's salt, Péligot's salt
Identifiers
3D model (
JSmol
)
ECHA InfoCard
 100.036.506 Edit this at Wikidata
  • InChI=1S/ClH.Cr.K.3O/h1H;;;;;/q;;+1;;;/p-1
    Key: PEBPTQFCMJWPGZ-UHFFFAOYSA-M
  • O=[Cr](=O)=O.[Cl-].[K+]
Properties
KCrO3Cl
Molar mass 174,5472 g/mol
Appearance orange solid
Density 2.5228 g/cm3
Soluble[vague]
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 Highly toxic, corrosive, carcinogenic
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Potassium chlorochromate is an inorganic compound with the formula KCrO3Cl.[4] It is the potassium salt of chlorochromate, [CrO3Cl]−. It is a water-soluble orange compound is used occasionally for oxidation of organic compounds. It is sometimes called Péligot's salt, in recognition of its discoverer Eugène-Melchior Péligot.

Structure and synthesis

Potassium chlorochromate was originally prepared by treating potassium dichromate with hydrochloric acid. An improved route involves the reaction of chromyl chloride and potassium chromate:[5]

K2CrO4 + CrO2Cl2 → 2KCrO3Cl

The salt consists of the tetrahedral chlorochromate anion. The average Cr=O bond length is 159 pm, and the Cr-Cl distance is 219 pm.[6]

Reactions

Although air-stable, its aqueous solutions undergo hydrolysis in the presence of strong acids. With concentrated hydrochloric acid, it converts to

18-crown-6, it forms the lipophilic salt [K(18-crown-6)]CrO3Cl.[7]

Peligot's salt can

oxidize benzyl alcohol, a reaction which can be catalyzed by acid.[8] A related salt, pyridinium chlorochromate
, is more commonly used for this reaction.

Safety

Potassium chlorochromate is toxic upon ingestion, and may cause irritation, chemical burns, and even ulceration on contact with the skin or eyes. .[9] Like other hexavalent chromium compounds, it is also carcinogenic and mutagenic.

References

  1. ^ Synonyms Of Chemicals. Csudh.edu (2003-09-16). Retrieved on 2011-06-01.
  2. ^ Merck & Co (1930). Merck's index: an encyclopedia for the chemist, pharmacist and physician. Merck & Co. Retrieved 1 June 2011.
  3. ^ Arthur Rose; Elizabeth Rose (1966). The Condensed chemical dictionary. Reinhold. Retrieved 1 June 2011.
  4. ^ Norm Stanley Colorful Chromium Compounds, 23 August 2002
  5. ISBN 9780470132333. {{cite book}}: |journal= ignored (help
    )
  6. doi:10.1107/S1600536802019396
    .
  7. doi:10.1107/S1600536805000085
    .
  8. S2CID 98721175
    .
  9. ISBN 978-0-9607118-6-4
    . Retrieved 1 June 2011.


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