The diffusion characteristics through an 8MR containing two Si atoms are significantly influenced by the type and position of compensating cations. When both Si atoms are compensated by protons (denoted as 2Si-2H-8MR), C2H6 faces a high activation energy barrier of 143 kJ/mol (Fig. ). In contrast, the activation energies for C2H4 diffusion range from 64 to 103 kJ/mol, depending on the specific proton positions within the 8MR (2Si-2H-8MR (OA) and 2Si-2H-8MR (OB) in Fig. ). C2H4 diffusion occurs in a manner that maximizes π interactions with the protons. When the protons are in the OA configuration, C2H4 traverses the 8MR nearly parallel to the elliptical window's long axis (Fig. ). However, in the OB configuration, the 8MR must slightly expand to facilitate C2H4 diffusion, resulting in an increased free energy barrier.