does not show significant change when passing from the homo-linker to the mixed-linker materials. The main contribution to the total pore volume comes from pores in the 10  w 12 Å range, in line with the Zr•••Zr distance found in the crystal structure between adjacent [Zr6] nodes (~13 Å). The percentage of the ultra-micropore volume decreases with increasing extent of fluorinated linker insertion, passing from 77% in MOF-801 to 72% and 62% in PF-MOF1