Question

Please answer question 1a

1. (a) For what value of free energy difference between donor and acceptor, ΔG⁰, is the rate of electron transfer a maximum? (5 points)

(b) Write an approximate expression for the transition state barrier when ΔG⁰ >> λ. How does the electron transfer rate change with increasing driving free

energy difference (ΔG⁰ a larger negative number) for the electron transfer in this limit? (5 points)

Answer 1

According to the Marcus theory of electron transfer the rate constant and  $\Delta G}$ are related as given below

k=ce-PreAART

When $\Delta G$ increases decreases.

So is maximum when $\Delta G$ is minimum.