In complex [Fe(bpy)]2+, colour arises due to
1
d-d transitions
2
due to charge transfer from ligand bpy to Fe orbitals
3
due to charge transfer from Fe2+ to \(\pi^*\) orbitals of bpy ligand
4
due to charge transfer from \(\pi^*\) orbitals of bpy to orbitals of Fe2+
5
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