A New Three-Dimensional Cd(II) Metal-Organic Framework for Highly Selective Sensing of Fe3+ as well as Nitroaromatic Compounds

A new three-dimensional Cd(II)-organic framework [Cd(H(2)BDDA)](n) based on fluorescent ligand, 4,4'-([2,2'-bipyridine]-6,6'-diylbis(oxy) diphthalic acid(H(4)BDDA), has been successfully achieved. The obtained [Cd(H(2)BDDA)](n) contained both fluorescent ligands and cadmium ions, thus showing multi-responsive photoluminescence sensing properties. It can be used to detect Fe3+ with a sensitivity of 2.69ppm in aqueous solution. For the fluorescence responses of [Cd(H(2)BDDA)](n) dispersed in water solution with gradually increased p-nitroaniline(p-NA) and N-methyl-4-nitroaniline (N-M-4-NA) concentrations, photoluminescence quenching can be detected even at a very low concentration of 0.68ppm for p-NA and 0.80ppm for N-M-4-NA, which indicated that [Cd(H(2)BDDA)](n) has an extremely high sensitivity to p-NA and N-M-4-NA. To our best knowledge, [Cd(H(2)BDDA)](n) is the first example of Cd(II) MOF based on the fluorescent ligand H(4)BDDA, which can be used for the detection of Fe3+ ions and NACs, especially for p-NA and N-M-4-NA.