Space-filling model of part of the crystal structure of KCrO₃Cl^[1]

Potassium trioxochlorochromate^[1], Potassium chlorochromate^[2][3][4], Peligot's salt, or Péligot's salt is a chemical substance named after Eugčne-Melchior Péligot^[5]. Its formula is KCrO₃Cl^[6]

Peligot's salt is the potassium salt of chlorochromic acid (chromic acid where chlorine has replaced one of the OH groups). Peligot's salt can be considered intermediate between chromic acid and chromyl chloride^[5].

It is stable in air but in water, where it is soluble,^[4] it can become hydrolysed. When under high temperature, Peligot's salt parts with its chlorine and produces chromic oxide^[5].

Potassium chlorochromate can be prepared from potassium dichromate, hydrochloric acid, and water. The substance may look like long orange-red crystals^[5].

Peligot's salt can oxidise the substance benzyl alcohol, a reaction which can be catalysed by acid^[7].

The structure of Peligot's salt has been redeterminated in 2002^[1].

(18-Crown-6)potassium chlorochromate

Space-filling model of the unit cell of (18-crown-6)potassium chlorochromate

Safety

Potassium chlorochromate can be toxic upon ingestion (may cause acute poisoning and kidney damage amongst other complications) or contact with the human skin (may cause eye burns, irritation, allergy, or ulceration), especially if inhalated.^[9] Heating the substance, or mixing it with acids, releases chlorine^[4] gas, which is also toxic.^[9]

References

pt:Clorocromato de potássio

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