紫精材料在外界刺激(如光、热、电)下会表现出灵敏的变色行为,在光学开关和分子传感识别中具有良好的潜在应用前景.通过一步反应合成了4-氟苯乙酮双取代紫精衍生物(VioF_(2)·2Cl).氟苯乙酮取代基的引入扩大了其共轭体系,起到稳定...紫精材料在外界刺激(如光、热、电)下会表现出灵敏的变色行为,在光学开关和分子传感识别中具有良好的潜在应用前景.通过一步反应合成了4-氟苯乙酮双取代紫精衍生物(VioF_(2)·2Cl).氟苯乙酮取代基的引入扩大了其共轭体系,起到稳定自由基的作用,使着色更稳定持久.VioF_(2)·2Cl在紫外(ultraviolet,UV)灯的照射下可以快速地从白色转变为浅黄色直至黄绿色,显示出了灵敏的光致变色行为.变色后晶体中的VioF_(2)^(2+)分子间具有更短的π···π^(*)作用距离,能够促进光致电子转移(photoinduced electron transfer,PET)过程的发生,并且起到稳定紫精阳离子自由基的作用,使其能够在氧气环境下持续变色3 d而不被氧化褪色.这种新型的紫精衍生物表现出了更为灵敏的光致变色性能及自由基着色稳定性,在光致变色材料领域具有良好的潜在应用可能.展开更多
A novel organic ligand, 6 (ortho methyl anilino carbonyl) 2 pyridine carboxylic acid (H o MAP), and the corresponding europium complex, tris(6 (ortho methyl anilino carbonyl) 2 pyridine carboxylato) europium...A novel organic ligand, 6 (ortho methyl anilino carbonyl) 2 pyridine carboxylic acid (H o MAP), and the corresponding europium complex, tris(6 (ortho methyl anilino carbonyl) 2 pyridine carboxylato) europium (Eu o MAP) were designed and synthesized. The results show that solid Eu o MAP is a conjugated complex, emitting strong red fluorescence dominantly due to a ligand sensitizd luminescence mechanism. The lifetimes of 5D 0 of Eu 3+ in the complex were examined using time-resolved spectroscopic analysis, and the lifetime values were (1.50±0.01) ms for solid Eu(o MAP) 3 and (1.10±0.01) ms for 1.0×10 -5 mol·L -1 Eu(o MAP) 3 ethanol solution, respectively. Thermogravimetric analysis shows that the europium complex has good thermal stability.展开更多
Based on the investigation of the luminescence of a series of rare earth organic chelates, some relationships between luminescence and the structure of the chelates were proposed: the intensity of sensitized luminesce...Based on the investigation of the luminescence of a series of rare earth organic chelates, some relationships between luminescence and the structure of the chelates were proposed: the intensity of sensitized luminescence of central lanthanide ions(Ln 3+ ) in a rare earth organic chelate depends on (1)the suitability of the energy gap between the excited triplet energy level of the ligands and the lowest excited energy level of Ln 3+ ions; (2)the rigidity and planarity of the structure of the chelate molecule; (3)the existence of a suitable secondary ligand which may increase rigidity and the stability of the chelate molecule; and (4) the existence of a suitable π conjugated system in the chelate molecule. According to the above relationships, 25 novel organic ligands were designed and synthesized, and their lanthanide chelates were prepared. Investigation of the photoluminescence for the new chelates shows that some of the chelates are strongly luminescent, and are applied to fluoroimmunoassay for determination of human immunoglobulin(IgG), to preparation of fluorescent plastics, and to determination of growth hormone for plants. Two novel spectroscopy probe techniques for structure of coordination compounds and biological molecules were proposed and developed based on vibronic spectroscopy of Tb 3+ complexes and fluorescence of Ce 3+ .展开更多
文摘紫精材料在外界刺激(如光、热、电)下会表现出灵敏的变色行为,在光学开关和分子传感识别中具有良好的潜在应用前景.通过一步反应合成了4-氟苯乙酮双取代紫精衍生物(VioF_(2)·2Cl).氟苯乙酮取代基的引入扩大了其共轭体系,起到稳定自由基的作用,使着色更稳定持久.VioF_(2)·2Cl在紫外(ultraviolet,UV)灯的照射下可以快速地从白色转变为浅黄色直至黄绿色,显示出了灵敏的光致变色行为.变色后晶体中的VioF_(2)^(2+)分子间具有更短的π···π^(*)作用距离,能够促进光致电子转移(photoinduced electron transfer,PET)过程的发生,并且起到稳定紫精阳离子自由基的作用,使其能够在氧气环境下持续变色3 d而不被氧化褪色.这种新型的紫精衍生物表现出了更为灵敏的光致变色性能及自由基着色稳定性,在光致变色材料领域具有良好的潜在应用可能.
文摘A novel organic ligand, 6 (ortho methyl anilino carbonyl) 2 pyridine carboxylic acid (H o MAP), and the corresponding europium complex, tris(6 (ortho methyl anilino carbonyl) 2 pyridine carboxylato) europium (Eu o MAP) were designed and synthesized. The results show that solid Eu o MAP is a conjugated complex, emitting strong red fluorescence dominantly due to a ligand sensitizd luminescence mechanism. The lifetimes of 5D 0 of Eu 3+ in the complex were examined using time-resolved spectroscopic analysis, and the lifetime values were (1.50±0.01) ms for solid Eu(o MAP) 3 and (1.10±0.01) ms for 1.0×10 -5 mol·L -1 Eu(o MAP) 3 ethanol solution, respectively. Thermogravimetric analysis shows that the europium complex has good thermal stability.
文摘Based on the investigation of the luminescence of a series of rare earth organic chelates, some relationships between luminescence and the structure of the chelates were proposed: the intensity of sensitized luminescence of central lanthanide ions(Ln 3+ ) in a rare earth organic chelate depends on (1)the suitability of the energy gap between the excited triplet energy level of the ligands and the lowest excited energy level of Ln 3+ ions; (2)the rigidity and planarity of the structure of the chelate molecule; (3)the existence of a suitable secondary ligand which may increase rigidity and the stability of the chelate molecule; and (4) the existence of a suitable π conjugated system in the chelate molecule. According to the above relationships, 25 novel organic ligands were designed and synthesized, and their lanthanide chelates were prepared. Investigation of the photoluminescence for the new chelates shows that some of the chelates are strongly luminescent, and are applied to fluoroimmunoassay for determination of human immunoglobulin(IgG), to preparation of fluorescent plastics, and to determination of growth hormone for plants. Two novel spectroscopy probe techniques for structure of coordination compounds and biological molecules were proposed and developed based on vibronic spectroscopy of Tb 3+ complexes and fluorescence of Ce 3+ .
