All geometries used in this work were relaxed using B3LYP-D3(BJ). We note that including or excluding Hartree-Fock exchange has little to no effect on R e and thus, we choose continue using the B3LYP-D3(BJ) method as the reference in the following cluster studies, in order to be consistent with the method used in obtaining the optimized geometries. We additionally note that, although the results of the three dispersion corrected calculations are comparable within chemical accuracy, one can deduce that the general trend of V min is DFT-NL ≤ DFT-D4 < DFT-D3(BJ) < DFT.