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A series of lanthanide coordination polymers based on flexible bis?(imidazole?4,5?dicarboxylate) ligand: Syntheses, structures and fluorescent properties
摘要： A series of lanthanide coordination polymers, namely {[Ln(HL)(H2O)2]·H2O}n (Ln= Ce(1), Pr(2), Nd(3), Eu(4) and Tb(5); H4L = 1,1'-(propane-1,3-diyl)bis(1H-imidazole-4,5-dicarboxylic acid)) have been synthesized under hydrothermal conditions and characterized by infrared spectroscopy, element analysis, single-crystal X-ray diffraction, powder X-ray diffraction and thermogravimetric analyses. These isostructural complexes exhibit a 3D framework with a sra topology built by HL3? anions μ4?bridging metal ions through two IDC groups in different coordination modes. The luminescent property of complexes containing Eu(III) and Tb(III) have also been investigated in detail.
关键词： Lanthanide,Topology,Imidazole-4,5-dicarboxylic acid,Luminescence,Crystal structure
更新于2025-09-10 09:29:36
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Two highly selective and sensitive fluorescent imidazole derivatives design and application for 2,4,6-trinitrophenol detection
摘要： In this paper, two nanoparticle fluorescence sensors (L1 and L2) were designed and synthesized for the detection of 2,4,6-trinitrophenol (TNP) in water. Density functional theory (DFT) calculations were used to assist in designing sensors and explaining the detection mechanism. A further illustration of the fluorescence quenching mechanism was also studied by 1H NMR titration and UV-Vis absorption spectroscopy. The Job’s plot demonstrates the combined stoichiometry of the sensor and TNP. Both sensors show low detection limit apparently (0.17 and 0.49 μM), fast and highly selective fluorescence response to TNP compared to other nitro-compounds. Moreover, L1 and L2 were successfully applied for the determination of TNP in real water samples.
关键词： Theoretical calculation,2,4,6-trinitrophenol detection,Fluorescent sensor,Imidazole derivative,Mechanism study
更新于2025-09-10 09:29:36
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Synthesis and Characteristics of New Organic Red Emissive Material Based on Phenanthro[9,10-d]imidazole
摘要： Red emission is one of the three primary colors that are essential for the realization of full-color displays and solid-state lightings. High solid-state efficiency is a crucial factor for the applications in organic light emitting diodes (OLEDs). In this work, two new donor-acceptor-donor type phenanthro[9,10-d]imidazole (PIM) -based derivatives, (2Z,2'Z)-2,2'-(1,4-phenylene)bis(3-(4-(1-phenyl-1H-phenanthro[9,10-d]imidazol-2-yl)phenyl)acrylonitrile) (PIDSB) and 2,3-bis(4'-(1-phenyl-1H-phenanthro[9,10-d]imidazol-2-yl)-[1,1'-biphenyl]-4-yl)fumaronitrile (PIDPh), are designed and synthesized. Both of them possess high thermal stabilities. PIDPh shows typical characteristics of aggregation-induced emission enhancement, while PIDSB displays aggregation-caused quenching effect. They both exhibit much red-shifted emissions compared with PIM owing to intramolecular charge transfer. In film state, the emission peaks of PIDSB and PIDPh locate at 538 nm and 605 nm with high photoluminescent quantum yields of 63.82% and 41.26%, respectively. The non-doped OLED using PIDPh as the active layer shows the maximum external quantum efficiency of 2.06% with a very low efficiency roll-off, and exhibits the electroluminescent peak at 640 nm with a Commission Internationale de l'éclairage coordinate of (0.617,0.396), meeting well with the criteria of red OLEDs.
关键词： red emissive material,high solid-state fluorescent efficiency,OLED,Phenanthro[9,10-d]imidazole,low efficiency roll-off
更新于2025-09-09 09:28:46
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Nickel ion detection by imidazole modified carbon dots
摘要： Nickel ions (Ni2+) were detected by a new imidazole modified carbon dots (CDs) based on fluorescence quenching method. Structural characterization of CD-imidazole quantum dots were accomplished by transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR). Spectroscopic properties were characterized by ultraviolet absorption spectrum and fluorescence spectrum. Ni2+ concentration showed good linear relationship with fluorescence quenching efficiency in the range of 6-100 mM (R = 0.99) and the limit of detection (LOD) was 0.93 mM. Imidazole modified CDs have strong selectivity of Ni2+ compared with other metal ions in aqueous solution. These results demonstrated that the fluorescence sense platform based on imidazole modified CDs can be applied to Ni2+ detection in environment.
关键词： Nickel ions,Fluorescence quenching,Carbon dots-imidazole quantum dots
更新于2025-09-04 15:30:14