"The blood-red colour produced by mixing aqueous solutions of Fe(III) and SCN^- (and which provides a well-known test for Fe(III)) is largely due to
[Fe(SCN)(H2O)5]^2+ but, in addition to this, the simple salt Fe(SCN)3 and salts of complexes such as [Fe(SCN)4]^- and Fe(SCN)6]^3- can also
be isolated."
N. N. Greenwood, A. Earnshaw, Chemistry of the Elements 2nd ed. (1997) p 1090.