It is worth noting that the distance between the catalytically active center to the electron source is crucial in determining activity. The effective range of diffusion for the immobilized molecular electrocatalyst (considering the coordination and solvation of the reactants) is on the order of tens of nanometers, thus, the length of the linkage is also an essential factor to consider when designing an immobilized system. Debates on whether the influence of the immobilized molecule is either through structure or through space are still ongoing. In the previous examples of strongly coupled graphite conjugated catalysts and weakly coupled amide-linked catalysts, we discussed that choosing the solvent in which the homogenous analogue of the anchored catalyst is soluble could enforce the weakly coupled electrode-catalyst complex to undergo a concerted pathway. Thus, the nature of bonding/linkage between the electrode and the molecular modification is not the sole factor that determines the catalytic activity. Electrostatic interactions between the immobilized molecule and the electrode play a crucial role.