5: Colours of some of the first row
transition metal ions in aqueous solutions From
left to right: V4+,V3+,Mn2+,Fe3+,Co2+,Ni2+and Cu2+ Complex compounds are those in which the metal ions bind a number
of anions or neutral molecules giving complex species with
characteristic properties A few examples are: [Fe(CN)6]
3–, [Fe(CN)6]
4–,
[Cu(NH3)4]
2+ and [PtCl4]
2–