Fig. 1. View on a unit cell of the crystal structure of desolvated ZIF-4(Zn) (1) along the crystallographic c axis. At room temperature the framework exhibits an open pore (op) phase exhibiting continuous porosity and at temperatures below 140 K the material features a closed pore (cp) phase with very small and inaccessible pores. C, N and Zn atoms are shown in grey, blue and yellow, respectively. The void surface is shown in green. Both structures are drawn to the same scale.
