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
Two hexaarylbisimidazoles were prepared from benzil, arylacetates and ammonium acetate after cyclization and oxidation. Their structures were identified by IR spectra and elemental analysis. The photochromic propertie...Two hexaarylbisimidazoles were prepared from benzil, arylacetates and ammonium acetate after cyclization and oxidation. Their structures were identified by IR spectra and elemental analysis. The photochromic properties of the hexaarylbisimidazoles were studied. The absorption spectra of hexaarylbisimidazole in solvents were measured. The decolouration kinetics of the bisimidazoles in dark circumstance was found to be followed through the second order reaction.展开更多
A novel photochromical compound,1-(4-bromobutyl)-3,3-dimethylspiro[indoline-2,3,-naphth-oxazine was synthesized and its structure was confirmed on the basis of IR,MS,1H NMR.The spectra of the compound were studied and...A novel photochromical compound,1-(4-bromobutyl)-3,3-dimethylspiro[indoline-2,3,-naphth-oxazine was synthesized and its structure was confirmed on the basis of IR,MS,1H NMR.The spectra of the compound were studied and the results showed that it had good photochromic properties.The thermal decay rate of the photochromic film prepared by mixing the compound with PMMA was decreased with good fatigue resistant property and good repeatability.展开更多
基金National Key Research and Development Program of China(2021YFA0718900)Key Collaborative Research Program of the Alliance of International Science Organizations(ANSO-CR-KP-2021-01)+5 种基金National Natural Science Foundation of China(51972328,62005301,52002392,62175248)Shanghai B&R International Cooperation Program(20640770200)Shanghai‘‘Science and Technology Innovation Action Plan’’Intergovernmental International Science and Technology Cooperation Program(21520712500)Shanghai Science and Technology Funds(23ZR1481900)Open Project of Wuhan National Laboratory for Optoelectronics(2022WNLOKF014)Science Foundation for Youth Scholar of State Key Laboratory of High Performance Ceramics and Superfine Microstructures(SKL202202)。
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Two hexaarylbisimidazoles were prepared from benzil, arylacetates and ammonium acetate after cyclization and oxidation. Their structures were identified by IR spectra and elemental analysis. The photochromic properties of the hexaarylbisimidazoles were studied. The absorption spectra of hexaarylbisimidazole in solvents were measured. The decolouration kinetics of the bisimidazoles in dark circumstance was found to be followed through the second order reaction.
文摘A novel photochromical compound,1-(4-bromobutyl)-3,3-dimethylspiro[indoline-2,3,-naphth-oxazine was synthesized and its structure was confirmed on the basis of IR,MS,1H NMR.The spectra of the compound were studied and the results showed that it had good photochromic properties.The thermal decay rate of the photochromic film prepared by mixing the compound with PMMA was decreased with good fatigue resistant property and good repeatability.
