So far, experimental values of adsorption energies of chlorinated methanes in DUT-8(Ni) are available for the case of a rigid op state. The experimental values were measured using small particles of DUT-8(Ni) (submicron sized and therefore rigid ) at around 300 K and up to adsorbed volumes of 150 cm 3 g -1 . This adsorbed volume corresponds to approximately 4.4 molecules per formula unit (f.u.) MOF (using the ideal gas approximation). Employing the Clausius-Clapeyron equation, the adsorption energies per mole guest (or molar adsorption energies) can be derived from the adsorption isotherms at varying temperatures. We can therefore only compare values around our maximum loading, these are in our nomenclature equal to E ads (nmax) /nmax. It is important to remember that neither experimental nor calculated values include a contribution from the opening of the MOF (∆E MOF ). Both the experimental and theoretical values are therefore with reference to the open MOF phase. In Figure , we present the obtained values for all guests including experimental ranges from references [26, 30].