首页|Luminescence Cd(II) coordination compounds based on a semi-rigid tricarboxylic acid ligand for identifying metal cations, inorganic anions and organic solvents
Luminescence Cd(II) coordination compounds based on a semi-rigid tricarboxylic acid ligand for identifying metal cations, inorganic anions and organic solvents
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NSTL
Elsevier
Highly effective recognition and detection of metal ions, anions and organic small molecules from water have attracted remarkable attention for environmental safety. Herein, a novel Cd-based coordination polymer [Cd(HL) (4,4'-bipy)(H2O)](n) (1) and a metal-organic framework {[Cd-3(L)2(bip)(2)(H2O)(3)].5H(2)O}(n) (2) have been synthesized by employing a semi-rigid tricarboxylic acid ligand (H3L) and different N-containing ligands under hydrothermal conditions, where H3L = 3-[(1-carboxynaphthalen-2-yl)oxy] phthalic acid, 4,4'-bipy = 4,4'- bipyridine, bip = 1,4-di(pyridine-4-yl) benzene. Single crystal X-ray analysis reveals that 1 presents a 4 -connected 2D network structure with a Schlali symbol of (44.62),whilst 2 possesses a (3,4,4)-connected 3D framework with a Schlafli symbol of (4.82)2(42.82.102)(8.104.12). Furthermore, 1 and 2 have been characterized by elemental analyses, FT-IR, powder X-ray diffraction, thermogravimetric analyses, fluorescence and UV spectra, exhibiting good stability and excellent photoluminescence properties. 1 and 2 have been chosen as fluorescent probes to sense different target analytes, showing an obvious selective recognition response to Co2+, Ag+, Cr(2)O7(2)(-), CrO42-, nitrobenzene and nitromethane through luminescence quenching effects in aqueous solutions. The possible fluorescence quenching mechanisms are studied in detail, revealing that fluorescence quenching is mainly related to weak interactions, competitive energy absorption and electron transfer.
Semi-rigid tricarboxylic acid ligandCoordination polymerMetal-organic frameworksFluorescence recognitionMetal cationsAnionsOrganic small moleculesFRAMEWORKSZN(II)FE3+COMPLEXES0D
NSTL
Elsevier
