Efficient removal of perchlorate ion from water by a water-insoluble M2L4 type compound.

Reaction of CuSO4·5H2O with 1,3-bis(benzimidazol-1-ylmethyl)-2,4,6-trimethylbenzene (m-bbitrb) provides a new positively charged M2L4 type molecule, [SO4⊂Cu2(m-bbitrb)4]SO4. This compound includes SO4(2-) inside and outside the cationic cage. Despite this compound being insoluble in water, it shows highly efficient perchlorate removal activity from water by the exchange with SO4(2-) outside the cage.

Solvent-soluble coordination polymer that reconstructs cyclic frameworks that trap a kinetically labile [Cu(CO3)2]2- unit.

A new 2D coordination polymer consisting of Cu(II) ions, bis-imidazole-type ligands, and CO3(2-) was prepared. This compound converted to new pentanuclear complexes with cyclic frameworks, which trapped a kinetically labile [Cu(CO3)2](2-) unit, by recrystallization from MeOH/Et2O or EtOH/Et2O.