Cd(II) frameworks with tetracarboxylate and imidazole-containing ligands: Syntheses, structures, adsorption and sensing properties

Two novel metal-organic frameworks (MOFs) [Cd-2(tib)(tpe)]center dot 5DMA center dot H2O (1) and [Cd-4(tipe)(2)(tpe)(2)]center dot 15CH(3)OH center dot 11H(2)O (2) (DMA = N,N-dimethylacetamide) were achieved by using cadmium(II) nitrate tetrahydrate to react with mixed multicarboxylate ligand of tetrakis(4-carboxyphenyl)ethene (H(4)tpe) and imidazole-containing one of 1,3,5-tris(1-imidazolyl)benzene (fib) or 1,1,2,2-tetrakis(4-(1-imidazolyl)phenyl)ethene (tipe) under solvothermal conditions. Both MOFs 1 and 2 have three-dimensional (3D) framework structures with distinct topologies. Due to the outstanding stability, porous structure and luminescence property, it was found that 1 can selectively adsorb gas molecules of CO2, light hydrocarbons as well as dye molecules of methyl orange (MO) and methyl blue (MB), and has selectivity for fluorescent sensing Fe-3(+).

Automated summary

Two novel metal-organic frameworks with distinct 3D structures were synthesized under solvothermal conditions, showing selective adsorption capabilities for CO2, light hydrocarbons, dye molecules, and fluorescent sensing of Fe-3(+).