Pore access explorer
Change a guest’s size to see how cavities and connecting windows determine pore access.
Two cavities, one window
Change the guest size
The cavity stays at 10 Å and the connecting window at 4 Å. The probe’s position updates as its diameter changes.
A guest can fit inside a cavity and still be unable to travel through the framework. The window is the bottleneck.
A 6 Å guest fits the cavity but cannot pass the 4 Å window.
This condition permits passage in the ideal geometry. Exact equality is treated as a frictionless fit. This rigid cutaway uses illustrative diameters and spherical guests. Real frameworks can flex, and molecular shape and interactions can affect diffusion. How Zeo++ defines pore geometry