Roussin's salt

noun

Rous·​sin's salt

ˈrüsə̇nz-

: 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

Word History

Etymology

after François-Zacharie Roussin †1894 French chemist

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