Fig. 1: Illustration of the “Cage-on-MOF” strategy.

a Advantages of the “Cage-on-MOF” material over pristine MOF, polymer-modified MOF, and cage-encapsulated MOF. b X-ray single crystal structure of PCC-4 (Supplementary data 1) and PCC-5 with secondary coordination sites. The cartoon for showing the cage-coordinated MOF composites: MOF@PCC-4 and MOF@PCC-5.