Simultaneous Control of Pore‐Space Partition and Charge Distribution in Multi‐Modular Metal–Organic Frameworks.

We report here a strategy for making anionic <italic>pacs</italic> type porous materials by combining pore space partition with charge reallocation. The method uses the first negatively charged pore partition ligand (2,5,8‐tri‐(4‐pyridyl)‐1,3,4,6,7,9‐hexaazaphenalene, H‐tph) that simultaneously enables pore partition and charge reallocation. Over two dozen anionic <italic>pacs</italic> materials have been made to demonstrate their excellent chemical stability and a high degree of tunability. Notably, <bold>Ni3‐bdt‐tph</bold> (bdt=1,4‐benzeneditetrazolate) exhibits month‐long water stability, while <bold>CoV‐bdt‐tph</bold> sets a new benchmark for C2H2 storage capacity under ambient conditions for ionic MOFs. In addition to tunable in‐framework modules, we show feasibility to tune the type and concentration of extra‐framework counter cations and their influence on both stability and capability to separate industrial C3H8/C3H6 and C6H6/C6H12 mixtures. [ABSTRACT FROM AUTHOR]