The behaviour of the kinetic-thermodynamic relationship is hence described by the combined effects of three parameters: Emin, corresponding to a driving force-independent preorganisation energy; Eeq, corresponding to the point at which the influence of the reactant and product stabilisation factors act equally on the TS; and θ, which modulates how strongly the barrier couples to the energy of the minima through the curvature (Figure ). (Emin -Eeq) is the reorganisation energy, equivalent to the Emin of the reverse process.