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本文报道了4-[4-((4-吡啶基)乙烯基)苯乙烯基]-N,N-二正丁基苯胺的合成及晶体结构,并讨论了它的吸收光谱、荧光光谱、荧光寿命、荧光量子产率及电致发光性质.该分子晶体属于三斜晶系, P-1空间群,晶胞参数为:a=1.0101(3) nm, b=1.0352(2) nm, c=2.6220(5) nm, Z=4, V=2.4224(10) nm3, R1=0.1006, wR2=0.1818.研究结果表明,该化合物在电致发光方面有潜在的应用价值.CCDC号:815101. 相似文献
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The escalating demand for crop production, environmental protection, and food safety warrants the development of new fungicides with greater efficiency, environmental friendliness, and innocuous metabolites to fight against destructive phytopathogens. Herein, we report on the synthesis and antifungal activity of dipeptide-based stilbene derivatives bearing a thiophene-substituted 1,3,4-oxadiazole fragment for the first time. In vitro bioassay indicated that the target compounds had remarkable antifungal potency superior to previously reported counterparts without a dipeptidyl group, of which compound 3c exhibited the highest activity against Botrytis cinerea with EC50 values of 106.1 μg/mL. Moreover, the in vivo protective effect of compound 3c (59.1%) against tomato gray mold was more potent than that of carboxin (42.0%). Preliminary investigations on the mode of action showed that compound 3c induced marked hyphal malformations and increased the membrane permeability of B. cinerea as well as inhibiting mycelial respiration. These promising results suggest that this novel type of molecular framework has great potential to be further developed as alternative fungicides. 相似文献
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采用Heck反应合成出6个带有不同推拉电子基团的二苯乙烯衍生物,产率68%~84%.研究了反应物分子结构对Heck偶联反应的影响,对实验条件进行了优化并探讨了其反应机理.结果表明,反应温度120℃,溶剂DMF 和Et3N体积比为2: 1时可以获得较高产率.同时我们还发现,不同的反应物结构对Heck反应产率的影响较大,随着反应物中双键的电子云密度的降低(对甲基苯乙烯>苯乙烯>4-乙烯吡啶),反应产率依次降低;芳卤的反应活性表现为:NO2-Ar-Br>H-Ar-Br>CH3-Ar-Br. 相似文献
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Synthesis of Copolymers of Methacrylate BearingAminonitro┐StilbeneDyesandTheirNonlinearOpticalProper
报道了含aminonitro-stilbene基团的甲基丙烯酸酯类单体的合成、该单体与MMA的共聚反应及对所得聚合物进行的非线性光学性能测定。结果表明,缩短stilbene片段与甲基丙烯酰基的连接链长有助于改善单体的聚合性能,增强聚合物在有机溶剂中的溶解能力。对所得聚合物的SHG测定显d33值可达到54pm/v。 相似文献
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Harm‐Anton Klok Stefan Becker Falk Schuch Tadeusz Pakula Klaus Müllen 《Macromolecular bioscience》2003,3(12):729-741
Two novel tetra‐ and hexahydroxy functionalized perylene chromophores have been used as initiators for the Sn(oct)2 catalyzed ring‐opening polymerization of different lactones. The arms of the resulting star polymers were comprised of either crystallizable poly(L ‐lactide) or poly(ε‐caprolactone) arms or of amorphous poly[γ‐(tert‐amyl)‐ε‐caprolactone] chains. The star polymers were investigated by differential scanning calorimetry, X‐ray scattering and dynamic mechanical and optical spectroscopy. Whereas the thermal properties of the poly(ε‐caprolactone) stars were barely affected by the star topology, crystallization of the poly(L ‐lactide) stars was strongly hindered by the star‐shaped architecture. Interestingly, for the amorphous poly[γ‐(tert‐amyl)‐ε‐caprolactone] stars a decrease in Tg with increasing chain length was found, reflecting the declining influence of the rigid perylene core on segmental mobility with increasing arm length. While the solid state and solution optical properties of high molar mass polyester stars were identical, the excitation and fluorescence emission spectra of spin‐coated films of the low molecular weight polymers revealed a red shift, pointing towards perylene – perylene interactions in these samples. The optical spectroscopy experiments suggested that arm length, rather than the number of arms, is the most important parameter determining encapsulation and preventing aggregation of the perylene core moieties in the solid state.
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Synthesis, Structure of a Symmetrically Substituted Stilbene with Strong Two-photon Absorption and Up-converted Blue Fluorescence 总被引:1,自引:0,他引:1
Xiao Mei WANG Guang Yong ZHOU Wen Tao YU Min Hua JIANG * State Key Laboratory of Crystal Materials Shandong University Jinan 《中国化学快报》2001,(11)
Symmetric substituted stilbenes have significantly potential application such as fluorescence microscopy, two-photon photodynamic therapy, optical power limiting, and three-dimensional storage1-2. These dyes have strong tendency of symmetric intra-molecular change transfer under the excited state. As a result, they usually exhibit large two-photon absorptivity (TPA), in the meanwhile emit strong up-converted fluorescence. On the other hand, their solutions generally display linear transmis… 相似文献
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Dr. Si-Hong Chen Dr. Shi-He Luo Dr. Long-Jiang Xing Dr. Kai Jiang Yan-Ping Huo Qi Chen Prof. Zhao-Yang Wang 《Chemistry (Weinheim an der Bergstrasse, Germany)》2022,28(4):e202103478
Six novel benzimidazole-based D-π-A compounds 4 a – 4 f were concisely synthesized by attaching different donor/acceptor units to the skeleton of 1,3-bis(1H-benzimidazol-2-yl)benzene on its 5-position through an ethynyl link. Due to the twisted conformation and effective conjugation structure, these dual-state emission (DSE) molecules show intense and multifarious photoluminescence, and their fluorescence quantum yields in solution and solid state can be up to 96.16 and 69.82 %, respectively. Especially, for excellent photostability, obvious solvatofluorochromic and extraordinary wide range of solvent compatibility, DSE molecule 4 a is a multifunctional fluorescent probe for the visual detection of nitroaromatic compounds (NACs) with the limit of detection as low as 10−7 M. The quenching mechanism has been proved as the results of photoinduced electron transfer and fluorescence resonance energy transfer processes. Importantly, probe 4 a can sensitively detect NACs not only in real water samples, but also on 4 a -coated strips and 4 a @PBAT thin films. 相似文献
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通过Wittig-Horner反应合成了两个含有均二苯乙烯发色团, 一端为N,N-双(2-乙酰氧乙基)氨基受体, 另一端分别为N,N-二甲氨基(DMDE)或N,N-二苯氨基(DPDE)的荧光探针分子. 进行了NMR和MS表征. 测试了加入不同金属离子时探针分子的吸收和荧光光谱变化. 加入Ag+和Zn2+, DMDE在420 nm处出现强的荧光峰, 在600 nm的荧光峰先增强后减弱, 认为发生了分子间的荧光共振能量转移. 而DPDE在加入Ag+和Zn2+, 420 nm处无荧光发射, 600 nm处的荧光红移并减弱. 相似文献
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设计合成了2个含双D-π-A结构的新型有机光敏染料DP1和DP2,利用高分辨质谱(HRMS)、核磁共振氢谱及核磁共振碳谱对其结构进行了表征。 研究了2个染料的光物理和电化学性质,并将其应用于染料敏化太阳能电池(DSSCs)的制作中。 在100×10-3 W/cm2(AM 1.5) 模拟太阳光的照射下,由染料DP2所制备的敏化太阳能电池的光电转化效率为4.10%;开路电压(Voc)、短路电流密度(Jsc)和填充因子(FF)分别为0.63 V、8.59×10-3 A/cm2和0.76。 而在同等条件下,由染料DP1所制作的染料敏化电池光电转化效率为3.83%。 相似文献
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通过水热法合成了2个金属-有机配位聚合物[Zn(boba)(bix)]n(1)和[Cd(L1)(L2)]2n·nH2O(2)(H2boba=4,4′-(丁烷-1,2-二氧基)-二苯甲酸,bix=1,4-双(咪唑基-1-基)苯,H2L1=4-(羧基甲氧基)苯甲酸,L2=2-(4-羟基)-1H-咪唑并[4,5-f][1,10]菲咯啉)。并对其进行了元素分析、红外光谱、热重和X-射线单晶衍射测定。配合物1为二维网状结构,配合物2为一维双链结构。此外,还研究了它们的荧光性质。 相似文献
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通过水热法合成了2个金属-有机配位聚合物[Zn(boba)(bix)]n=(1)和[Cd(L1)(L2)]2n=·nH2O(2)(H2boba=4,4’-(丁烷-1,2-二氧基)-二苯甲酸,bix=1,4-双(咪唑基-1-基)苯,H2L1=4-(羧基甲氧基)苯甲酸,L2=2-(4-羟基)-1H-咪唑并[4,5-f][1,10]菲咯啉)。并对其进行了元素分析、红外光谱、热重和X-射线单晶衍射测定。配合物1为二维网状结构,配合物2为一维双链结构。此外,还研究了它们的荧光性质。 相似文献
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用硝基苄基鏻与取代苯甲醛经Wittig反应合成了一系列含硝基的二苯乙烯型化合物.研究表明,用硝基苄基鏻在二氯甲烷中进行这类Wittig反应时,随着苯甲醛的取代基不同,得到二苯乙烯主要产物的构型不同,取代基为NMe2,OMe,Me,Cl,H等时主要得到E式产物,取代基为CN和NO2等时主要得到Z式产物;进一步比较3种苄基鏻原料分别与6种不同取代苯甲醛反应后产物的Z/E比,发现用含硝基的苄基鏻作原料时,随苯甲醛上取代基的吸电子效应减小,产物的Z/E比也减小,而用苄基鏻或对甲基苄基鏻作原料时,没有观察到这种Z/E比减小的趋势.通过测定产物的晶体结构,确证了6个目标化合物的分子构型,另外通过核磁共振谱、气-质联用色谱、紫外光谱和红外光谱对各二苯乙烯化合物的结构进行了详细表征. 相似文献
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Different types of stilbene derivatives (D-π-D, A-π-A, D-π-A) were investigated with AM1, and specially, equilibrium geometries of symmetrical stilbene derivatives (D-π-D) were studied using of PM3. With the same method INDO/CI, the UV-vis spectra were explored and the position and strength of the two-photon absorption were predicated by Sum-Over-States expression. The relationships of the structures, spectra and nonlinear optical properties have been examined. The influence of various substituents on two photon absorption cross-sections was discussed micromechanically. 相似文献
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Eu(DBM)3qp和Eu(DBM)3pp的晶体结构及荧光性质对比研究 总被引:2,自引:0,他引:2
两种新型铕配合物Eu(DBM)3qp(DBM=二苯甲酰甲烷,qp=喹喔啉并[2,3-i]-1,10-邻二氮杂菲)和Eu(DBM)3pp(DBM=二苯甲酰甲烷,pp=吡嗪并[2,3-i]-1,10-邻二氮杂菲)的晶体结构均属单斜晶系,P2(1)/c空间群.中心铕离子分别与DBM配体的六个氧原子及第二配体的两个鳌合氮原子配位,形成八配位的扭曲四方反棱柱构型.两种配合物晶体中,每四个配合物分子的第二配体共轭平面相互平行,形成一种特殊的"块"状π-π堆积单元.在紫外光激发下两种配合物均表现为Eu3+的特征发射,由于第二配体能级的不同,Eu(DBM)3pp的发射强度比Eu(DBM)3qp高十几倍. 相似文献