The incorporation of heterovalent copper-oxo and copper-halide clusters for the fabrication of three porous cluster organic frameworks: syntheses, structures and iodine adsorption/release study

Abstract

Three porous heterovalent cluster organic frameworks Cu₂(H₂O)(Cu₄I₄)(INA)₄·solvent (1), Cu₂(H₂O)₂(Cu₄I₄)₂(INA)₄(DABCO)₂·2DMA (2) and [(Cu₂)₂(PVBA)₈(Cu₄I₄)]·DMF (3) (HINA = isonicotinic acid, DABCO = 1,4-diazabicyclo[2.2.2]octane, HPVBA = 4-(2-(4-pyridyl)ethenyl) benzoic acid, DMF = N,N′-dimethylformamide, DMA = N,N′-dimethylacetamide) have been solvothermally synthesized and structurally characterized. Crystal structure analyses indicate that compounds 1 and 2 are constructed from planar four-connected Cu₂(CO₂)₄ secondary building units (SBUs) and tetrahedral four-connected Cu₄I₄ SBUs, while compound 3 is composed of octahedral six-connected Cu₂(CO₂)₄ SBUs and tetrahedral four-connected Cu₄I₄ SBUs. All these frameworks possess nano-sized 1-dimensional channels. Furthermore, the thermal and chemical stabilities, gas adsorption properties and iodine adsorption/release ability of compound 2 have been systematically studied.