What is the name of the complex [Fe(H2O)5NO]SO4 that is formed in the brown ring test?

Question

some say that it is PENTAAQUANITROSYLIRON(II)SULPHATE. some say that it is PENTAAQUANITROSYLIRON(I)SULPHATE taking that the oxidation state of iron is 1 and that of NO is 1. since NO is a neutral ligand i have a confusion as to which is the correct name.

Answer 1

[Fe(H2O)5NO]SO4 is a difficult compound to name which is why the test is still referred to as the Brown Ring Test.

Initially upon formation the Iron is Fe (II).  However a charge (electron) transfer from the NO Nitrosyl ligand to the Iron occurs making the NO +1 and reducing the Iron from Fe (II) to Fe (I).

The correct names for these compounds are

Pentaaqua Nitrosyl Iron (II) Sulfate and

Pentaaqua Nitrosonium Iron (I) Sulfate

Answer 2

It's simply nitroso ferrous sulphate.

Answer 3

Its is also named as "nitrosoferroussulphate"