System ∆F (r min ) r min ∆F (r min ) r min ∆F (r min ) r min ϵ = 10.6 (a) ϵ = 8.0 (b) ϵ = 6.0 (c) TBT(I i ) -3.51 scaled with the dielectric constant. As a consequence, one would expect that the energetic contribution to the free energy between the Li + ion and the TBT system is given by the binding energy calculated in the gas phase scaled by the dielectric constant.