roussin's salt

roussin's salt
\\ˈrüsə̇nz-\ noun
Usage: usually capitalized R
Etymology: after François-Zacharie Roussin died 1894 French chemist
: 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

Useful english dictionary. 2012.

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