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(a) Crystal structures of zirconium tetrahedra 64–67. Color code: Zr, turquoise; O, red; N, blue; C, black. Yellow balls represent the cage inner void. (b) Scheme for the postassembly modification (PAM) of cage 65 containing up to six functionalized sites per cage. Adapted with permission from ref (101). Copyright 2018 American Chemical Society.
