High Quality Content by WIKIPEDIA articles! 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. Roussin's Black Salt is produced by the reaction of nitrous acid, potassium hydroxide, potassium sulfide, and iron(II) sulfate in aqueous solution. 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.

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