FIGURE 2. The cages in ZIF-95 and ZIF-100.
From the following article:
Colossal cages in zeolitic imidazolate frameworks as selective carbon dioxide reservoirs
Bo Wang, Adrien P. Côté, Hiroyasu Furukawa, Michael O'Keeffe & Omar M. Yaghi
Nature 453, 207-211(8 May 2008)
doi:10.1038/nature06900
a, Ball and stick diagrams of the cages in ZIF-95; Zn in blue. b, Structure of poz B cage in ZIF-95; ZnN4 tetrahedra are shown in blue, N in green, C in grey and Cl in pink. c, Space filling diagram of poz B cage in ZIF-95; Zn in blue, N in green, C in grey and Cl in pink. d, Ball and stick diagram of moz cage in ZIF-100. e, Structure of moz cage in ZIF-100; O in red. f, Space filling diagram of moz cage in ZIF-100; O in red. All H atoms are omitted for clarity. Note that Cl atoms fill one half of the positions, however the disorder is illustrated here.