共查询到19条相似文献,搜索用时 78 毫秒
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合成了基于联萘酚骨架并具有电子给体二芳基胺(NN)、电子给受体二芳基胺和二芳基硼(BN)、电子给受体二芳基胺和氰基(4N2CN)的系列手性发光分子, 通过引入不同的受体基团和扩展分子的手性骨架来比较几个分子的性质差异. 由于分子内电荷转移(ICT)特性, 化合物BN和4N2CN表现出显著的温度响应型荧光发射位移. 二芳基硼的引入使得BN在常见有机溶剂中的荧光量子效率相比NN明显提高并表现出更显著的溶剂化变色效应. 为了探索它们的手性光学性质, 三个消旋体化合物在光学提纯后进行圆二色光谱(CD)和圆偏振发光光谱(CPL)测试. 因为化合物4N2CN手性骨架的扩展, 其CPL信号和发光不对称因子(glum)优于NN. 这项工作可能有助于开发新型手性发光材料, 也为增强分子激发态的手性信号提供了一种思路. 相似文献
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联萘酚及其衍生物具有C2轴不对称性、修饰位点多、手性构型高度稳定等特点,在分子或离子识别、有机电致发光(OLED)、非线性光学以及分子机器等光电功能材料领域得到了广泛研究并展现出良好的应用前景。本文依据联萘酚衍生物光电功能材料分子结构的不同,总结了其结构修饰的设计原理、修饰方法及其应用,评述了各位点修饰材料的结构和光电性能的关系:单位点及多位点修饰的联萘酚,主要是通过氢键作用、光诱导电子转移(PET)等机理实现分子或离子识别,多应用于荧光化学传感器;双位点修饰的联萘酚,主要是利用扭转非平面结构和π共轭特性等调节光电性能,广泛应用于OLED;同样,基于C2轴不对称性和手性诱导特性,联萘酚衍生物在非线性光学以及分子机器等领域也展现出良好的应用。最后,展望了联萘酚类光电功能材料的研究和发展方向。 相似文献
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将前沿科学成果引入大学有机化学综合实验课中,设计了基于联二萘酚手性聚集诱导发光分子的合成、表征及性质研究的有机化学综合实验。通过本实验,学生将掌握几类经典的有机反应,包括酚羟基保护、芳基甲酰化及缩合等反应的基本原理及操作,熟悉核磁共振、质谱等结构表征手段以及紫外-可见吸收光谱、荧光光谱以及圆二色光谱等性质表征技术,了解聚集诱导发光现象及机理。本实验综合了多种有机反应及性质表征技术,有利于提升学生的综合实验能力、科学研究思维并激发学生对科学研究的兴趣。 相似文献
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金属卤化物钙钛矿纳米材料因其丰富的化学结构和优异的光电性能,已成为一种极具应用前景的半导体材料。在钙钛矿无机框架中引入有机手性分子后,能够比较容易地得到手性钙钛矿纳米材料,从而可以极大地推动智能光电材料和自旋电子器件的快速发展。本文将综述手性钙钛矿纳米材料的构筑与手性产生机理的最新研究进展,包括一维手性钙钛矿纳米线、二维及准二维手性有机-无机杂化钙钛矿纳米片、三维手性钙钛矿纳米晶、超分子组装体系中诱导的手性钙钛矿纳米晶等。值得注意的是,不同种类的手性钙钛矿纳米材料在圆二色性、圆偏振发光、铁电性、自旋电子学等方面展现出优异的光电性能及巨大的应用前景。但是,有关手性钙钛矿纳米材料的研究目前还处于初级阶段,其中很多机理还存在争议,许多基础性和应用型的工作也有待开展。 相似文献
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圆偏振发光(Circularly polarized luminescence,CPL)有机分子是一类重要的手性光学材料,在有机光学和有机电子学等领域受到广泛关注。通过引入手性联萘基团和构建推拉电子结构的设计理念同时实施到双硼氮桥联联吡啶单元,发展出了一系列具有推拉电子结构的手性四配位硼分子。结果表明,改变给电子单元可以调节分子的发光现象,含有二苯胺(2a)和咔唑(2b)单元的分子展现出典型的聚集诱导荧光淬灭现象,而含有9,9-二甲基-9,10-二氢吖啶(2c)单元的分子具有特征的聚集诱导发光性质。手性联萘基团的引入使3个分子具有手性光学性质,展现出圆二色信号和圆偏振发光特性,它们的不对称因子均超过了1×10-3,另外,改变给电子单元有效调节了手性分子的发光颜色。 相似文献
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手性有机半导体由于其新颖的性质引起了有机光电领域极大的研究兴趣. 将手性引入有机半导体材料不仅可以调控聚集态结构影响载流子输运进而影响光电器件的性能, 而且催生了圆偏振光直接发射与探测材料与器件的产生与发展. 手性材料与圆偏振光之间的相互作用使得其在3D显示、量子通讯、信息存储与处理等领域展示出广泛的应用前景. 本综述总结近年来手性有机光电材料及器件的研究进展, 主要围绕手性对有机半导体材料性质与器件性能的影响展开, 聚焦于手性有机半导体的圆偏振光直接发射与探测等研究, 旨在进一步为手性有机光电子领域的发展提供系统的认识. 相似文献
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Meng Li Yin‐Feng Wang Dongdong Zhang Lian Duan Chuan‐Feng Chen 《Angewandte Chemie (International ed. in English)》2020,59(9):3500-3504
The use of a chiral, emitting skeleton for axially chiral enantiomers showing activity in thermally activated delayed fluorescence (TADF) with circularly polarized electroluminescence (CPEL) is proposed. A pair of chiral stable enantiomers, (?)‐(S)‐Cz‐Ax‐CN and (+)‐(R)‐Cz‐Ax‐CN, was designed and synthesized. The enantiomers, both exhibiting intramolecular π‐conjugated charge transfer (CT) and spatial CT, show TADF activities with a small singlet–triplet energy difference (ΔEST) of 0.029 eV and mirror‐image circularly polarized luminescence (CPL) activities with large glum values. Notably, CP‐OLEDs based on the enantiomers feature blue electroluminescence centered at 468 nm with external quantum efficiencies (EQEs) of 12.5 and 12.7 %, and also show intense CPEL with gEL values of ?1.2×10?2 and +1.4×10?2, respectively. These are the first CP‐OLEDs based on TADF‐active enantiomers with efficient blue CPEL. 相似文献
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Yiping Liu Prof. Aiyou Hao Prof. Pengyao Xing 《Chemistry (Weinheim an der Bergstrasse, Germany)》2022,28(57):e202201956
Chirality transfer from chiral molecules to assemblies is of vital importance to the design of functional chiral materials. In this work, selective co-assembly behaviors between chiral molecules and an achiral luminophore, potentially driven by the intermolecular salt-bridge type hydrogen bonds are reported. Cyano-substituted tetrakis(arylthio)benzene carboxylic acid ( TA ) served as the luminophore and hydrogen bond donors, which underwent co-assembly with different chiral amines. It was found that structures of chiral amines affect the chirality transfer and the properties of co-assemblies due to effects on hydrogen bonds and stacking pattern. Only in specific co-assemblies, the chiroptical properties occurred at both ground state and excited states based on the emerged Cotton effects and circularly polarized luminescence (CPL) signals, revealing that the chirality was successfully transferred from molecular level to supramolecular level. In addition, accurate quantitative examination of chiral amines was realized by circular dichroism (CD) spectra. This work demonstrates the characteristic chirality response and transfer through co-assembly, providing a potential method to develop smart chiroptical materials. 相似文献
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具有圆偏振发光性质的热活化延迟荧光(circularly polarized thermally activated delayed fluorescence,CP-TADF)材料,因其在数据存储、生物成像以及3D显示等领域的应用前景,受到学者们的广泛关注。基于此类材料所制备的圆偏振热活化延迟荧光器件展现出优异的器件性能。本文从圆偏振热活化延迟荧光材料的发光机理及分子设计策略出发,依据CP-TADF材料构筑方法的不同,概括了其结构设计策略,系统地综述了各种类型CP-TADF材料的分子结构和光电性能的关系及其在电致发光器件领域的应用,最后探讨了目前CP-TADF材料存在的问题,并展望了其未来发展前景及挑战。 相似文献
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Dr. Rongrong Hu Dr. Jacky W. Y. Lam Yi Liu Xiaoa Zhang Prof. Ben Zhong Tang 《Chemistry (Weinheim an der Bergstrasse, Germany)》2013,19(18):5617-5624
A series of nonplanar tetraphenylethene (TPE)–hexaphenylbenzene (HPB) adducts was designed and synthesized by Diels–Alder reaction of the acetylene precursors and tetraphenylcyclopentadienone. All of the adducts showed aggregation‐induced emission features. The twisting amplitude and steric hindrance of the TPE and HPB units were found to play a crucial role in their fluorescence behaviors in the aggregated state. 相似文献
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Patthira Sumsalee Dr. Laura Abella Sitthichok Kasemthaveechok Dr. Nicolas Vanthuyne Marie Cordier Dr. Grégory Pieters Prof. Jochen Autschbach Dr. Jeanne Crassous Dr. Ludovic Favereau 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(66):16505-16511
Luminescent exciplexes based on a chiral electron donor and achiral acceptors are reported as a new approach to design circularly polarized (CP) and thermally activated delayed fluorescence (TADF) emitters. This strategy results in rather high CP luminescence (CPL) values with glum up to 7×10−3, one order of magnitude higher in comparison to the CPL signal recorded for the chiral donor alone (glum ∼7×10−4). This increase occurs concomitantly with a CPL sign inversion, as a result of the strong charge-transfer emission character, as experimentally and theoretically rationalized by using a covalent chiral donor-acceptor model. Interestingly, blue, green-yellow and red chiral luminescent exciplexes can be obtained by modifying with the electron accepting character of the achiral unit while keeping the same chiral donor unit. These results bring new (inter)molecular guidelines to obtain simply and efficiently multi-color CP-TADF emitters. 相似文献
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Two Cp*−RhIII based trefoil knots were obtained in high yield under ambient conditions via the coordination-driven self-assembly of semi-rigid thioether dipyridyl ligand 1,4-bis[(pyridin-4-ylthio)methyl]benzene ( L1 ), ligand chloranilic acid (H2− CA ) and 6,11-dihydroxytetracene-5,12-dione (H2- TtDo ) with Cp*RhIII metal corner units, respectively. Furthermore, using the bulkier 4,4′-{[(2,5-dimethyl-1,4-phenylene)bis(methylene)]bis(sulfanediyl)}dipyridine ( L2 ) in the place of ligand L1 in the construction process resulted in the formation of a teranuclear metallacycle and a template-free Borromean ring in high yields thanks to significantly altered intermolecular forces between the constituent ligands induced by the sterically-hindering methyl groups of L2 , as demonstrated via a detailed X-ray crystallographic analysis and NMR spectroscopy. 相似文献