For Mn the ground state is S=3/2 for the bare MOF and the trend in terms of binding energies and ∆EI-L is similar to the Fe case. S=1/2 and S=3/2 are computed. We predict a progressive increase of the ∆EI-L as the strength of the binding increases, i.e. from CO2 to CO. CO2 yields a binding energy of 0.550 eV and a negative adiabatic energy difference of -1.040 eV. For the strong field ligand CO, we compute 2.463 eV (binding) and 2.745 eV (spin splitting energy). Thus, as for the Fe case, we expect the spin crossover transition not to occur as an entropy driven process for adsorbed CO.