Synthesis and Structure-Linear and Structure-Nonlinear Optical Properties of Multi-Dipolar Zigzag Oligoaryleneethynylenes
摘要:
A novel series of monodisperse, multi-dipolar zigzag oligoaryleneethynylenes DA(n) and D-Ar-A(n), bearing electron-donating dibenzothiophene and electron-accepting dibenzothiophene dioxide as arenes, with up to six charge-transfer (dipolar) units have been designed and synthesized by palladium-catalyzed Sonogashira coupling reactions. The linear and nonlinear optical properties of these multi-dipolar oligoaryleneethynylenes can easily be modified or enhanced by incorporating/extending with various central aryleneethynyl moieties such as phenylethynyl, oligo(9,9-dibutylfluorenyl)ethynyl, and oligothienylethynyl within the donor-acceptor units. Interestingly, the absorption and emission of these zigzag oligoaryleneethynylenes are not dependent on the number of covalently linked dipolar chromophores; however, the fluorescence quantum efficiencies consistently decrease with increased number of covalently linked dipolar units. These zigzag oligoaryleneethynylenes exhibit a linear increase in the two-photon absorption (TPA) cross-sections with increased number of covalently linked dipolar units without red-shifting the absorption and emission spectra. In addition, very large TPA cross-sections in the femtosecond regime (sigma(800) = 1306 GM in DMF or sigma(750) = 1522 GM in CH2Cl2) were obtained for D-TF-A(4) despite the moderate strength of the donor-acceptor pair. Our results suggest that the TPA properties of these zigzag oligoaryleneethynylenes including TPA wavelength and TPA cross-section can easily be tuned by means of modifying the central aryleneethynylene units and increasing the number of dipolar units, respectively. This approach provides an alternative means to tune or enhance the TPA cross-section at a specific wavelength.
摘要利用Ullmann C–N偶联反应,合成了一组由电子接受的二苯并噻吩核和给电子的低聚咔唑树枝状分子组成的新型咔唑树枝状聚合物,即G1SF和G2SF。树枝状聚合物的设计方式使其在普通有机溶剂中显示出良好的溶解性,在高达430°C的分解温度(T d)下具有出色的热化学稳定性,并且在-5.45 eV至-5.37 eV的范围内具有较高的HOMO水平。密度泛函理论计算(DFT)的结果表明,G2SF在空穴和电子传输部分几乎完全分离了HOMO和LUMO能级。而G1SF可能仅由于分子内电荷转移而使HOMO和LUMO能级仅部分分离。以树枝状大分子为主体,传统绿色铱磷光体为掺杂发射体,通过旋涂法制备了绿色磷光OLED。在环境条件下,G1SF的最大亮度效率(ηL)为19.83 cd A -1,G2SF的最大外部量子效率为5.85%,G2SF的最大外部量子效率为15.50 cd A -1和4.57%。
A general procedure for the synthesis of methylthio-, methylseleno- and methyltelluro-substituted aromatic compounds
作者:Lars Engman、Jonas S.E. Hellberg
DOI:10.1016/0022-328x(85)80366-1
日期:1985.12
A one-pot procedure is described which allows the facile introduction of one or two methylchalcogeno groups into a variety of monobromo or dibromo aromatics. The bromo compounds were converted to their corresponding lithio derivatives by treatment with t-butyllithium in tetrahydrofuran at −78°C, and these derivatives were then treated, at ambient temperature with elemental sulfur, selenium, or tellurium
[EN] NEW DIBENZOFURANS AND DIBENZOTHIOPHENES<br/>[FR] NOUVEAU DIBENZOFURANES ET DIBENZOTHIOPHÈNES
申请人:IDEMITSU KOSAN CO
公开号:WO2015140073A1
公开(公告)日:2015-09-24
The present invention relates to compounds of formula (I) which are characterized in that they are substituted by at least one nitrile substituted carbazolyl group and their use in electronic devices, especially electroluminescent devices. When used as electron transport material, hole blocking material and/or host material for phosphorescent emitters in electroluminescent devices, the compounds of formula I may provide improved efficiency, stability, manufacturability, or spectral characteristics of electroluminescent devices.
Synthesis and properties of fully conjugated macrocycles composed of m -diethynylene-phenylene-bridged two dibenzofuran, dibenzothiophene and carbazole units
Fullyconjugated macrocycles 1a−1c composed of m-diethynylene-phenylene-bridged two dibenzofuran, dibenzothiophene and carbazole units were synthesized via Sonogashira cross coupling reactions under high-diluted condition. These conjugated macrocycles were fully characterized by 1H NMR, 13C NMR, FT-IR, Mass spectroscopies and elemental analysis. Photophysical and redox properties of 1a−1c were investigated
完全共轭的大环化合物1A - 1C组成的米-diethynylene亚苯基桥连的2二苯并呋喃,二苯并噻吩和咔唑单元被通过高稀释条件下的Sonogashira交叉偶联反应来合成。这些共轭的大环化合物通过1 H NMR,13 C NMR,FT-IR,质谱和元素分析进行了全面表征。分别通过紫外可见/荧光光谱和循环伏安法研究了1a - 1c的光物理性质和氧化还原性质,并将这些特征与相应的线性苯基乙炔基二苯并杂酚11a - 11c进行了比较。。此外,在理论上以B3LYP / cc-pVDZ // B3LYP / 6-31G(d)的水平通过理论计算研究了它们的结构和电子见解。
Nickel-catalyzed and Li-mediated regiospecific C–H arylation of benzothiophenes
作者:Yorck Mohr、Gaëlle Hisler、Léonie Grousset、Yoann Roux、Elsje Alessandra Quadrelli、Florian M. Wisser、Jérôme Canivet
DOI:10.1039/d0gc00917b
日期:——
A nickel-based catalytic system for the regiospecific C2–H arylation of benzothiophene has been established. NiCl2(bpy) is used as a catalyst in combination with LiHMDS as a base in dioxane. The catalytic system is applicable to a variety of functionalized benzothiophenes, as well as other heteroarenes including thiophene, benzodithiophene, benzofuran and selenophene in combination with iodo aryl electrophiles