Reversible mechanofluorochromism of aniline-terminated phenylene ethynylenes
作者:Seth A. Sharber、Kuo-Chih Shih、Arielle Mann、Fanny Frausto、Terry E. Haas、Mu-Ping Nieh、Samuel W. Thomas
DOI:10.1039/c8sc00980e
日期:——
rings of the PE chromophore, resulting in interrupted conjugation and an absence of chromophore aggregation. The MC behavior of an analog without the perfluoroarene rings is severely attenuated. This work demonstrates the general utility of twisted PEs as stimuli-responsive moieties and reveals clear structure–property relationships regarding the effects of alkyl chain length on these materials.
Disclosed herein is a bacteriochlorin-based organic dye represented by Formula (II):
wherein the substituents contained in Formula (II) are as defined herein. The bacteriochlorin-based organic dye is stable in air, and may be used as a photosensitizer in dye-sensitized solar cell.
Synthesis and Optical Properties, Including Two-Photon Absorption Cross-Sections, of Differentially Functionalized Starburst-Type π-Conjugated Molecules
Differentially functionalized hexakis( p-substituted-phenylethynyl)benzene and hexakis[4-( p-substituted-styryl)phenylethynyl]benzene derivatives with various (D6h, D3h, D2h, and C2v) symmetries were synthesized by Sonogashira cross-coupling reactions. The optical properties of this starburst-type π-conjugated system were investigated. Among them, hexakis[4-( p-dioctylaminostyryl)phenylethynyl]benzene (5) showed the largest two-photon absorption cross-section of δ = 818 GM at 800 nm, which was determined by open aperture Z-scan with 120 fs laser pulses in toluene solution.
Optoelectronic and Self-assembly Properties of Porphyrin Derivatives with Click Chemistry Modification
作者:Liang Pengxia、Zhengcai Du、Dong Wang、Zhou Yang、Huiyun Sheng、Shuqiong Liang、Hui Cao、Wanli He、Huai Yang
DOI:10.1002/cphc.201402401
日期:2014.11.10
functionalized porphyrin molecules containing electron‐rich alkynes, synthesized by means of the Sonogashira coupling reaction were further modified by reacting the ethynyl groups with click reagent through a formal [2+2] click reaction. The photophysical and electrochemical properties of the porphyrinderivatives were studied by UV/Vis spectroscopy and cyclic voltammetry. We show that the optoelectronic properties
Homoconjugated and Spiro Push–Pull Systems: Cycloadditions of Naphtho- and Anthradiquinones with Electron-Rich Alkynes
作者:Timothy Swager、Cagatay Dengiz
DOI:10.1055/s-0036-1588771
日期:2017.7
We report the synthesis and characterization of three new classes of push–pull chromophores using [2+2]-cycloaddition reactions of electron-rich alkynes and electron-poor alkenes. Previous investigations have focused on the reactions of cyano-substituted electron acceptors. This study demonstrates that cyano-free electron acceptors, naphtho- and anthradiquinones, can also be used to access extended
我们报告了使用富电子炔烃和贫电子烯烃的 [2+2]-环加成反应合成和表征三类新型推挽发色团。以前的研究集中在氰基取代的电子受体的反应上。该研究表明,不含氰基的电子受体、萘醌和蒽醌也可用于访问扩展的推挽系统。通过紫外/可见光谱研究了结构变化对光谱和电子特性的影响。通过溶液中的 X 射线和 NMR 分析确认了结构。