Pyridinium linkers and mixed anions in cationic metal–organic frameworks

Pyridinium linkers direct the formation of a cationic metal organic framework [Cu(ipq)]A (where H2ipq+ = 1-(3,5-dicarboxyphenyl)-4-(pyridin-4-yl)pyridinium, A− = NO3−, BF4−, BF4−/PF6−), CALF-32(A), where intra-pore anions can be varied and mixed to control porosity and gas uptake.