Roussin's black salt

Roussin's Black Salt
Other names

Sodium heptanitrosyltri-μ3-thiotetraferrate
Identifiers
CAS number 12518-87-5
Properties
Molecular formula Fe4N7NaO7S3
Molar mass 552.67 g/mol
Appearance Black needles
Melting point

198-200 °C (471-473 K)
Related compounds
Related Roussin's Red Salt
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Roussin's Black Salt is a chemical compound with the formula NaFe4S3(NO)7. It is classified as metal nitrosyl compound. It consists of the sodium salt of the [Fe4S3(NO)7]− anion. The geometry of the anion cluster is that of an incomplete cubane. The point group symmetry of the anion is C3v.

Contents

Synthesis

Roussin’s Black Salt is produced by the reaction of nitrous acid, potassium hydroxide, potassium sulfide, and iron(II) sulfate in aqueous solution.[1] It can also be formed by the conversion of Roussin's Red Salt in mildly acidic conditions. This reaction is reversible and Roussin’s Red Salt is reformed upon alkalization of the reaction solution.

Uses

Roussin’s Black Salt is a nitric oxide donor. The nitric oxide donated by Roussin’s Black Salt has proven to be toxic to some melanoma cancer cells.[2] Also, Roussin’s Black Salt demonstrates antibacterial activity in some food processing applications.[3]

See also

References

Footnotes

  1. ^ L. Marchlewski; J. Sacks. “Studien über Roussins Salz.” Z. Anorg. Chem. 1892, 2, 175–181.
  2. ^ Janczyk, A.; et al.. "NO-dependent phototoxicity of Roussin’s black salt against cancer cells." Nitric Oxide, 2004, 10, 42-50.
  3. ^ Greenwood, N. N.; & Earnshaw, A. (1997). Chemistry of the Elements (2nd Edn.), Oxford:Butterworth-Heinemann

Notations