ZIF-8 has a cubic crystal structure (space group I43m, lattice parameter = 16.99 Å) with large pores of 11.6 Å; the perspective view and top view along {111} direction is shown in fig. ) and 1(d) respectively. The location of the Bragg planes (marked with red circles in fig. ) is indicated in the model of a ZIF-8 unit cell in fig. ) and 1(d), respectively. The pores in the unit cell are interconnected using the gates with an aperture size of 3.4 Å shown (with a yellow circle) in fig. , represented by {431} planes, is shown by the large red circle in the ED pattern in fig. .