Frémy's salt

Frémy's salt is a chemical compound with the formula (K4[ON(SO3)2]2), sometimes written as (K2[NO(SO3)2]). It is a bright yellowish-brown solid, but its aqueous solutions are bright violet. The related sodium salt, disodium nitrosodisulfonate (NDS, Na2ON(SO3)2, CAS 29554-37-8) is also referred to as Frémy's salt.

Frémy's salt
Names
IUPAC name
Potassium nitrosodisulfonate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.034.729
EC Number
  • 238-219-0
PubChem CID
UNII
  • InChI=1S/2K.H2NO7S2/c;;2-1(9(3,4)5)10(6,7)8/h;;(H,3,4,5)(H,6,7,8)/q2*+1;/p-2
    Key: IHSLHAZEJBXKMN-UHFFFAOYSA-L
SMILES
  • N([O])(S(=O)(=O)[O-])S(=O)(=O)[O-].[K+].[K+]
Properties
K2NO(SO3)2
Molar mass 268.33 g/mol (potassium salt)
Appearance Yellowish-brown solid
Hazards
GHS labelling:
Danger
H260, H302, H312, H332
P223, P231+P232, P280, P301+P312, P302+P352+P312, P304+P340+P312
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Regardless of the cations, the salts are distinctive because aqueous solutions contain the radical [ON(SO3)2]2−.

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