An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
The effective detection of organic amines is particularly important for environmental protection and human health. Herein, according to hard and soft acid base theory, a novel three-dimensional (3D) butterfly shaped Eu4(OH)2 cluster-based metal-organic framework with Lewis basic triazole sites, {[Eu4(taip)4(ox)(OH)2(H2O)4]·3H2O}n (1) (H2taip = 5-(1,2,4-triazol-1-yl) isophthalic acid, H2ox = oxalic acid), was successfully synthesized under solvothermal conditions, and was characterized by single crystal X-ray diffraction, powder X-ray diffraction, elemental analysis, infrared spectroscopy and thermogravimetric analysis. Structural analysis reveals that compound 1 is a 3D net constructed from butterfly shaped Eu4(OH)2 clusters and contains isosceles triangular channels with dimensions of 8.84 × 8.84 × 8.63 Å3, which shows an unprecedented 8-connected topology with a Schläfli symbol {36·418·53·6}. Fluorescence experiments of compound 1 show sensitive luminescence quenching responses to organic amines such as diethylamine (DEA), trimethylamine (TMA), triethylamine (TEA), ethylenediamine (EDA) and aniline, and the quenching constants (KSV) decrease in the following order: EDA > DEA > TMA > TEA > aniline. The fluorescence quenching responses may be attributed to the energy gap between the LUMO energy values of H2taip and organic amines, which hinders the transfer of excited state energy to the emission state of Eu3+ and results in luminescence quenching. The fluorescence lifetimes of compound 1 in ethanol and organic anilines indicate that the fluorescence recognition process of organic amines was static.
With the growing interests in two-dimensional (2D) materials, the rational assembly of new 2D coordination frameworks with functional properties has attracted extensive attentions. Four new isomorphic compounds with 2D→2D interpenetrating structures, [M(cppp)2]n [M = Co (1), Cu (2), Ni (3) and Zn (4); Hcppp = 1- (4-carboxylphenyl)-3-(pyrid-4-yl) pyrazole] were rationally assembled through the reactions between suitable organic ligand (Hcppp) and nitrates. Compounds 1-4 were completely characterized by adsorption and desorption isotherms, elemental analysis, infrared spectroscopy, powder X-ray diffraction, scanning electron microscopy, single crystal X-ray diffraction and thermo-gravimetric analysis. The solid state fluorescence spectrum of compound 4 indicates an attractive blue luminescence behavior with a maximum emission peak at 473 nm, and the corresponding solvent-emulsions show turn-off fluorescence behavior to nitrobenzene (NB) in pure water environment. The quenching constant (KSV) and detection limit of compound 4 for electron-deficient NB reached 2.46 × 103 M–1 and 6.19 × 10–6 M, respectively. Notably, SEM and N2 adsorption-desorption isotherm indicated the block crystals of compound 4 after ultra-sonication can been effectively stripped into 2D lamellar structure, which can effectively provide recognition sites of π•••π interactions for NB. According to the experimental and theoretical simulation results, fluorescence quenching behavior of compound 4 by NB should be attributed to synergistic effects of competitive absorption between compound 4 and NB, Förster resonance energy transfer and photo-induced electron transfer.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
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