At higher energies (not reported here), the vibrational modes of the pyrazine [700-1500] cm -1 and cyanide stretching modes [2100-2200] cm -1 which appear with intense and well-defined peaks, were found to undergo negligible changes upon SO2 adsorption. The experimental data show two well defined peaks for the bare MOF centered at ca. 96 and 396 cm -1 and less resolved peaks between them. The first peak at 96 cm -1 blueshifts and becomes broader and less intense upon CO and CO2 adsorption. It blueshifts to 133 cm -1 for CO and to ca. 116 cm -1 for CO2. The second peak at 396 cm -1 redshifts upon CO adsorption while it is negligibly affected by the CO2 uptake.