Question

Give the IUPAC name of Na4[Fe(CN)5NOS].

Answer 1

Sodium Ferro cyno nitriso sulphid

Answer 2

Answer: sodium pentacyanidothionitritoferrate(II)

Explanation:

Na4[Fe(CN)5(NOS)] => sodium pentacyanidothionitritoferrate(II)

Na4[Fe(CN)5(NO)] => sodium pentacyanidonitrosylferrate(II) or nitroprusside

[Fe(CN)5(NO)](2-) [nitroprusside] + S(2-) [sulphide] = [Fe(CN)5(NOS)](2-) [violet complex]

NO(+) + S(2-) = NOS(-) or thionitrite [similar to nitrite or ONO(-)]