Ionothermal synthesis and characterization of a 3-D (4, 8)-connected porous anionic metal–organic framework entrapped with 1-D [K2(H2O)6] chains

A novel metal–organic coordination polymer, namely, {[K2(H2O)6][Cd3(1,2,4,5-BTC)2]}n (1) (1,2,4,5-BTC = 1,2,4,5-benzenetetracarboxylate), was synthesized in an ionothermal reaction by using an ionic liquid 1-ethyl-3-methylimidazolium bromide ([EMIM]Br) as solvent. Complex 1 features a novel 3-D (4, 8)-connected porous anionic architecture constructed by linking trinuclear Cd subunits with 1,2,4,5-BTC4− ligands, which are further filled with 1-D [K2(H2O)6] cationic chains.