hi I would like to ask why is there a difference between the following redox potentials?
[Fe(H2O)6]3+ + e- <---> [Fe(H2O)6]2+
and
[Fe(CN)6]3- + e- <---> [Fe(CN)6]4-
Thanks much
CN
- is a strong ligand and it stabilises Fe(III) w.r.t Fe(II) -> it makes [Fe(CN)
6]
3- more difficult to be reduced to Fe(II) compared to [Fe(H
2O)
6]
3+. Hence, the E0 value of [Fe(CN)
6]
3- is lower