Constructing new functional metal-organic frameworks (MOFs) is receiving considerable attention worldwide and is a ¿hot topic¿ owing to their potential for gas storage, separation, and purification. We request 6 days on WISH to study the preferred binding sites and locations of adsorbed gas molecules (NO2, NO, N2O, C2D2, C2D4, and C2D6) within two metal-carboxylate porous MOF materials as a function of different gas loadings. The high resolution and large d-spacing capabilities of WISH make it ideal for analysing the precise locations of gas molecules within these porous MOFs.