Ionothermal synthesis and crystal structure of a 2D metal organic framework: [emim] 2[Cd 2(btec)Br 2] (emim = 1-ethyl-3-methylimidazolium, btec = 1,2,4,5-benzenetetracarboxylate)

Abstract

A novel metal organic framework, namely, [emim] 2[Cd 2(btec)Br 2] ( 1) (emim = 1-ethyl-3-methylimidazolium, btec = 1,2,4,5-benzenetetracarboxylate), was synthesized in an ionothermal reaction by using an ionic liquid 1-ethyl-3-methylimidazolium bromide as solvent and template. Single-crystal X-ray diffraction reveals that the structure features an anionic two-dimensional framework with novel coordination mode of btec ligand. The imidazolium cation emim + of the ionic liquid acting as charge compensating agent intercalated into the [ Cd 2 ( btec ) Br 2 ] n 2 n - interlayers.