Altogether, it is apparent that the framework topology not only affects the heat of adsorption in the limit of low coverage, but also the extent of guest-guest interactions, including -in some cases -intricate differences between TCE and PCE. In order to develop a more detailed understanding of the adsorption behavior in zeolites of particular interest, fixed-loading MC simulations were performed for one or two selected loadings, depending on the system, and representative simulation snapshots were visualized. For MTW, the simulation snapshot obtained for near-saturation conditions (20 PCE/s.c.), visualized in the left panel of Figure , shows that the PCE molecules fit very well into the pores of this system. Similar to the observations made for TON, the Cl atoms point into "bulges" of the undulating channels, resulting in strong host-guest interactions. Unlike in TON, however, the adsorbed PCE molecules do not lie in the same plane, but assume a preferred orientation that is somewhat tilted with respect to the running direction of the channels. This tilted arrangement allows for stronger attractive guest-guest interactions, for example, through electrostatic interactions between Cl atoms and positively polarized C atoms of adjacent PCE molecules. In IFR, visualized in the right panel of Figure , yet another scenario is observed: