616501.fig.009a
(a)
616501.fig.009b
(b)
616501.fig.009c
(c)
616501.fig.009d
(d)
Figure 9: (a) Octahedral cage in PCN-20. (b) Cuboctahedral cage with alignment of the unsaturated metal center (UMCs) in PCN-20. (c) Cuboctahedral cage with open metal sites aligned orthogonally in PCN-20. (d) Square channels of PCN-20.