共查询到19条相似文献,搜索用时 250 毫秒
1.
合成了一系列新型的6-氯-8-溴-螺吡喃光致变色化合物, 并用核磁共振氢谱、红外光谱、质谱和元素分析对目标化合物进行了表征, 利用X射线单晶衍射仪测定了1′,5′-甲基取代化合物的晶体结构.通过UV-Vis光谱对化合物在不同溶剂中的光致变色性能进行了研究, 讨论了溶剂和结构对光致变色性能的影响.在极性较大的溶剂中, 光致变色现象明显; 给电子能力较强的基团和强极性溶剂使最大吸收波长蓝移. 相似文献
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合成了一系列新型的6-氯-8-溴-螺吡喃光致变色化合物,并用核磁共振氢谱、红外光谱、质谱和元素分析对目标化合物进行了表征,利用X射线单晶衍射仪测定了1′,5′-甲基取代化合物的晶体结构.通过UV-Vis光谱对化合物在不同溶剂中的光致变色性能进行了研究,讨论了溶剂和结构对光致变色性能的影响.在极性较大的溶剂中,光致变色现象明显;给电子能力较强的基团和强极性溶剂使最大吸收波长蓝移. 相似文献
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合成了两种新的二芳基乙烯类光致变色化合物1,2 双(2 甲基5 (4 乙氧基苯基)噻吩3 基)全氟环戊烯(1a)和1,2 双(2 甲基5 (对氟苯基)噻吩3 基)全氟环戊烯(2a),并且研究了其在不同溶剂和浓度中的UV Vis光谱、荧光性质和光致变色反应动力学特征.实验结果表明,化合物1a和2a具有良好的光致变色性质和较强的荧光;光致变色闭环反应为零级反应,开环反应为一级反应. 相似文献
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研究9种带有芳香稠环或杂环基团的光致变色螺吡喃化合物的光致变色性能和荧光性质.通过紫外-可见吸收光谱和荧光光谱对该类化合物与DNA相互作用性能进行了初步探讨. 相似文献
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具有光致变色和发光性能的有机化合物的合成及其性能研究 总被引:8,自引:0,他引:8
以吲哚啉螺苯并吡喃与香豆素衍生物为原料,用DcC缩合酯化法在温和条件下合成了8种新的具有光致变色和发光性能的化合物,确定了结构,研究了紫外光谱、荧光光谱及光致变色性.所得化合物同时具有光致变色和发荧光的双重特性,而且荧光光谱中有两个激发波长,每一个波长对应产生一个不同的荧光发射峰. 相似文献
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2-(2′-取代乙烯基)-5-联苯基噁唑的合成及光性能的研究 总被引:2,自引:0,他引:2
通过2-甲基-5-联苯基噁唑分别与苯甲醛、取代苯甲醛和呋喃甲醛缩合,合成了十五种2-(2’-取代乙烯基)-5-联苯基噁唑。测定了它们的熔点、红外光谱、核磁共振谱、紫外光谱、荧光光谱、荧光量子产率和激光转换效率.并借助红外谱图、核磁谱图对化合物的结构进行了分析. 相似文献
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设计合成了一系列含席夫碱基的螺吡喃双功能光致变色材料4a~4n. 通过1H NMR, IR和HRMS对其结构进行了表征. 研究了化合物在几种溶剂和PMMA膜中的光致变色性质, 研究了化合物4a在甲醇中, 以及化合物4a和4f在高分子介质聚甲基丙烯酸甲酯(PMMA)中的消色过程. 结果表明, 化合物4e在PMMA膜中光照后呈现出与其它化合物不同的颜色, 为罕见的绿色. 化合物4a在二氯甲烷溶液中有良好的荧光性能. 所合成的新型含席夫碱基的螺吡喃双功能光致变色材料在甲醇、二氯甲烷和环己烷溶液中及在PMMA膜中均表现出良好的光致变色性质. 相似文献
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L. K. Karabaeva I. A. Platonova I. V. Zavarzin S. I. Luiksaar V. N. Yarovenko B. V. Nabatov M. M. Krayushkin V. A. Barachevski 《Chemistry of Heterocyclic Compounds》2011,47(2):229-236
The precursors and hybrid compounds, including photochromic fulgimides and fluorescent benzothiazolylthienothiophene units,
have been synthesized. Spectroscopic investigations by absorption and fluorescence methods showed that fulgimide hybrids display
photochromism, but do not display fluorescence properties. A possible explanation for this fact is proposed and also the decreased
effectiveness of photochromic conversion. 相似文献
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A series of dihydropyrenes with appending fluorescent moieties were synthesized with the objective of increasing the photochromic efficiency for this class of compounds and to establish how suitable fluorescence would be to follow their photochromic behavior. The ring opening quantum yields of dihydropyrenes with aroyl substituents at the 4-position showed increased ring opening quantum yields without a decrease of the half-life for the thermal reversion of the less stable open isomer, the metacyclophanediene to the dihydropyrene. The fluorescence of the appending naphthoyl or pyrenoyl moieties was not suitable to follow the photochromic cycling of the dihydropyrenes. However, the emission detected above 600 nm of the closed isomer of the dihydropyrene moiety was shown to be a good monitoring method for the photochromic cycling. 相似文献
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A series of bisthienylethenes containing imidazole and imidazolium derivatives have been prepared and the products have been characterized by means of NMR and MS.Their photochromic and fluorescent switch properties have been investigated by UV–vis absorption spectra and fluorescence spectra.The fluorescent emissions of these kinds of photochromic compounds can be simply modulated by varying the imidazole groups,which shows that these compounds may have potential application in the design of fluorescent photochromic materials. 相似文献
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Tiesheng Hu Zhipeng Li Tingting Wang Heping Zeng 《Journal of heterocyclic chemistry》2016,53(1):109-116
Four new diarylethene derivatives based on thiophene or thiazole moieties were designed and synthesized, and the structures of compounds 4a and 5a were determined by single‐X‐ray diffraction analysis. All of these compounds showed reversible photochromic reactions and notable fluorescence photo‐switches in solution. Furthermore, diarylethenes 4a and 5a also showed good photochromism in single crystal phase. The electron‐donating and electron‐withdrawing substituents play the same role in the photochromic process: red‐shifted absorption and fluorescence ( 1a and 2a compared with 3a ). The fluorescent modulation efficiencies of asymmetrical diarylethenes 4 and 5 were significantly enhanced compared with the similar dithienylethenes, and the fatigue resistance of 5 was much better than 4 , which showed that the diarylethene bearing electron‐withdrawing group could improve its fatigue resistance. 相似文献
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NunoM.F.S.A. Cerqueira AnaM.F. Oliveira‐Campos PauloJ. Coelho LuísH.Melo deCarvalho Andr Samat Robert Guglielmetti 《Helvetica chimica acta》2002,85(2):442-450
Novel 2H‐chromenes derived from hydroxycoumarins were synthesized, and their photochromic behaviour was studied under flash‐photolysis conditions, showing a wide absorption range in the visible region. All the compounds exhibit low fluorescence, which apparently has no negative effect on their photochromic properties. 相似文献
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Deniz E Ray S Tomasulo M Impellizzeri S Sortino S Raymo FM 《The journal of physical chemistry. A》2010,114(43):11567-11575
We designed and synthesized three compounds incorporating a BODIPY fluorophore and an oxazine photochrome within the same molecular skeleton and differing in the nature of the linker bridging the two functional components. The [1,3]oxazine ring of the photochrome opens in less than 6 ns upon laser excitation in two of the three fluorophore-photochrome dyads. This process generates a 3H-indolium cation with a quantum yield of 0.02-0.05. The photogenerated isomer has a lifetime of 1-3 μs and reverts to the original species with first-order kinetics. Both photochromic systems tolerate hundreds of switching cycles with no sign of degradation. The visible excitation of the dyads is accompanied by the characteristic fluorescence of the BODIPY component. However, the cationic fragment of their photogenerated isomers can accept an electron or energy from the excited fluorophore. As a result, the photoinduced transformation of the photochromic component within each dyad results in the effective quenching of the BODIPY emission. Indeed, the fluorescence of these photoswitchable compounds can be modulated on a microsecond time scale with excellent fatigue resistance under optical control. Thus, our operating principles and choice of functional components can ultimately lead to the development of valuable photoswitchable fluorescent probes for the super-resolution imaging of biological samples. 相似文献
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Two novel isomeric photochromic diarylethenes with an indene bridging unit have been prepared by a simple and efficient one‐step synthesis method. Their properties, including photochromic behavior, fluorescent properties and fatigue resistance, have been investigated. These two isomeric compounds showed photochromic back‐and‐forth reactions with ultraviolet and visible light both in solution and in PMMA film. Their ring‐open forms exhibited appreciable fluorescence, which was quenched by the ring‐closed forms. All results indicated that diarylethenes derivatives with indene‐aryl bridges exhibited rather high fatigue resistance and good thermally irreversible photochromic properties. 相似文献