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Roussin's salt

noun Rous·sin's salt \ ˈrüsə̇nz- \

Definition of Roussin's salt

: any of two series of alkali metal salts that are nitrosyl and sulfur complexes of iron:
a : a red unstable salt having the general formula M[Fe(NO)2S] and obtainable by reaction of nitric oxide with ferrous sulfide
b : a black more stable salt having the general formula M[Fe4(NO)7S3] and obtainable (as by treatment with alkali) from a red salt

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Origin and Etymology of roussin's salt

after François-Zacharie Roussin †1894 French chemist

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