[Inorganic] Colours of Complexes and Compounds

[Cr(H2O)6]2+

[Cr(H2O)6]2+

blue

[Cr(H2O)6)]3+

green

Cr2O72-

orange

CrO42-

yellow

Cr(OH)3

grey-green ppt

[Cr(OH)6]3-

dark green

[Mn(H2O)6]2+

pale pink

MnO2

black/brown solid

MnO42-

dark green

MnO4-

purple

Mn(OH)2

off-white ppt

[Cu(H2O)6]2+

light blue

[Cu(NH3)4(H2O)2]2+

dark blue

Cu(OH)2

Pale blue ppt

[CuCl4]2-

yellow

[CuCl2]-

colourless

CuO

black solid

Cu2O

brick red

CuI

off-white ppt

CuCO3

green ppt

[Fe(H2O)6]2+

green

[Fe(H2O)6]3+

yellow

Fe(OH)2

green ppt

Fe(OH)3

red-brown ppt

[Fe(CN)6]4-

yellow

[Fe(SCN)(H2O)5]2+

blood red