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Two novel ESIPT benzothiazol derivatives and corresponding europium(Ⅲ) complexes: Synthesis and fluorescent properties
摘要： Two ESIPT benzothiazol derivatives and corresponding europium complexes were synthesized and characterized by the 1HNMR spectrum, Mass spectrum, Elemental analysis, UV–Vis analysis, Molar conductivity, Thermogravimetric analysis and FTIR analysis. The fluorescence intensity of the ligands and complexes are compared, and the fluorescence quantum yields are also calculated by the reference method. The results show that two ligands emit orange fluorescence due to the ESIPT process, but both complexes emit red fluorescence after coordinating with Eu3+. Compared with the ligands, the fluorescence intensity and fluorescence quantum yield of the complexes are enhanced, and the monochromaticity is also improved. Because of the stable tetradentate coordination, the fluorescence intensity of EuL7(NO3)3·2H2O is the strongest, and the order of fluorescence intensity is EuL7(NO3)3·2H2O > EuL6(NO3)3·2H2O > Ligand 6 > Ligand 7, so does the fluorescence quantum yields. The electrochemical properties of the complexes show that the HOMO energy level of EuL7(NO3)3·2H2O is higher than that of EuL6(NO3)3·2H2O, but LUMO energy level is lower than that of EuL6(NO3)3·2H2O. These ligands and complexes have potential applications in the field of life sciences and optical materials.
关键词： Electrochemical property,Benzothiazol derivative,Synthesis,ESIPT,Europium complex,Fluorescence property
更新于2025-09-23 15:22:29
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Synthesis, structure, luminescence and electrochemical and antioxidant properties of anion‐controlled silver(I) complexes with 2,2′‐(1,4‐butanediyl)bis‐1,3‐benzoxazole
摘要： To explore the influence of various anions on the self‐assembly and properties of silver complexes, reactions of anions of silver salts with 2,2′‐(1,4‐butanediyl)bis‐1,3‐benzoxazole (BBO) afforded four complexes, formulated as [Ag2(BBO)2(p‐toluenesulfonate)2] (1), {[Ag(BBO)(picrate)]}∞ (2), {[Ag(BBO)1/2(o‐coumarate)]·DMF}∞ (3) and {[Ag2(BBO)3](PF6)2}∞ (4). These complexes were characterized using elemental analysis, infrared spectroscopy and single‐crystal X‐ray diffraction. The crystal analysis results show that under the influence of coordination modes and steric hindrance of anions, the complexes exhibited binuclear (1), one‐dimensional polymeric (2 and 3) and two‐dimensional polymeric (4) structures. Compared with the BBO ligand, only complex 1 has a new emission peak at 428 nm, which is attributed to ligand–metal charge transfer. The emission peaks of complexes 2–4 are similar to those of the BBO ligand, which can be due to π–π* and n–π* transitions. These results indicate that anions can modulate the structures and luminescent properties of silver complexes. Moreover, cyclic voltammograms of 1–4 indicated an irreversible Ag+/Ag couple with the order of reversibility being 2 > 1 > 4 > 3. In vitro antioxidant experiments showed that complex 3 has significant antioxidant activity against superoxide and hydroxyl radicals.
关键词： luminescence,anion regulation,electrochemical property,antioxidant,Ag(I) complex
更新于2025-09-11 14:15:04
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Structural Modification, Synthesis Mechanism and Properties Analysis of Li4Ti5O12 Anode Materials
摘要： Li4Ti5O12 microsphere was synthesized by hydrothermal method. The effects of amount of lithium hydroxide, hydrothermal time and sintering temperature on properties of sample were studied. The synthesis mechanism of Li4Ti5O12 microsphere was preliminary analyzed. The structural characterization was analyzed by X-ray diffraction, and the morphology was investigated by scanning electron microscopy and transmission electron microscopy. The properties of galvanostatic charge, discharge and cycle stability were also studied. The results indicated that when 2.55 mmol LiOH?H2O reacted with 0.2 g hydrolysate, the sample had pure phase, when the hydrothermal condition was 36 h and 180 oC, the structure of sample particle was intactly spherical. The volume average size of samples were between 400 nm to 600 nm. The charge and discharge voltage plateau of samples were very stable. When the sintering temperature was 700 oC, the first discharge capacity was 148.3 mAh?g-1 at 0.1 C. After 10th cycle, the discharge capacity retained at 132.5 mAh?g-1.
关键词： hydrothermal method,electrochemical property,hydrothermal condition,Lithium titanate
更新于2025-09-04 15:30:14