Guest diffusion in dipeptide crystals

Abstract

In this work we determined the transport diffusivities of CO₂, CH₄, N₂, O₂, and Ar in Leu–Ser dipeptide crystals, which display unidirectional 4.9 Å-wide nanochannels. The effects of crystal length, temperature, pore loading and of the molecular size of the guests were investigated. We show that the mass transport in Leu–Ser crystals is fast, in the upper end of the values reported for zeolites, and that the pore blocking may be significant.