Isostructural mesoporous ionic crystals as a tunable platform for acid catalysis.

Eleven isostructural mesoporous ionic crystals (meso–PICs) are synthesized. The initial activities of the Barbier-Grignard reaction, which is a typical C–C bond formation reaction, catalyzed by the meso-PICs are dependent on the acid dissociation constant of the aqua ions of Mn+ and the types of polyoxometalates, which construct the meso-PICs.