Effect of temperature on intermolecular electron transfer from reduced MMOR3e to oxidized MMOH. (A) Four-exponential parallel fits (solid lines) through kinetic data recorded at 458 nm for the reaction of 20 μM MMOR3e with 10 μM MMOH at 4 (red), 10 (blue), 20 (green), and 30 °C (purple). (B) Arrhenius plot for determination of activation energies: k1 (circles), k2 (squares), and k3 (triangles).