Two d(10) luminescent metal–organic frameworks as dual functional luminescent sensors for (Fe(3+),Cu(2+)) and 2,4,6-trinitrophenol (TNP) with high selectivity and sensitivity

Two luminescent 3D supramolecular structures [Cd(3)(L)(2)(2,2-bipy)(2)](DMF)(3)(CH(3)CH(2)OH)(2)(H(2)O) (1) and [Zn(3)(L)(2)(2,2-bipy)(2)(DMF)(2)](DMF)(2)(CH(3)CH(2)OH)(2)(H(2)O) (2) (H(3)L = 4,4′,4′′-nitrilotribenzoic acid) have been successfully synthesized under solvothermal conditions using Cd(NO(3))(2)·4H(2)O or Zn(NO(3))(2)·6H(2)O as the metal sources, and 4,4′,4′′-nitrilotribenzoic acid (H(3)L), 2,2-bipy as the ligands in DMF solvent. Compound 1 displays a bi-nodal (2,3,6)-coordinated net with {8(3)}(2){8(6)·12(6)·16(3)}{8}(6) topology, compound 2 can be described as a (3,6)-connected 2-nodal net with kgd topology. The phase purity of compound 1 and 2 is characterized by X-ray powder diffraction (XRPD), thermogravimetric analysis (TGA) and Fourier transform infrared (FT-IR) spectroscopy. Compound 1 and 2 can serve as effective luminescent sensors for Fe(3+), Cu(2+) and TNP via luminescent quenching.