Donor/Acceptor-Substituted Tetraethynylethenes: Systematic Assembly of Molecules for Use as Advanced Materials
作者:Rik R. Tykwinski、Martin Schreiber、Raquel Pérez Carlón、François Diederich、Volker Gramlich
DOI:10.1002/hlca.19960790818
日期:1996.12.11
such as 11 or 44, in agreement with the presence of highly polarized excited states in these molecules. Correspondingly, fluorescence spectra of TEEs bearing only donor or acceptor substituents showed little solvent dependency. The large majority of the donor/acceptor-substituted TEEs are thermally and environmentally stable molecules. They can be stored for months as solids in the air at room temperature
制备了带有电子给体(对甲氧基苯基或对氨基苯基)和/或电子接受性(对硝基苯基)基团的一系列全面的四乙炔基(= 3,4-二乙炔基己烯-3-烯-1,5-二炔,TEE)通过[Pd]催化的Sonogashira交叉偶联反应。研究了这些分子的电子和光子特性,并特别强调了由中心TEE核心周围的供体/受体取代程度和模式所引起的影响。该分析表明,分子内供体-受体相互作用(如长波长电荷转移带所证明)在TEE 44和46中显着更有效,反式和顺,线性缀合供体和受体之间的电子通路,比11,与孪位的,交叉共轭的电子通道。UV / VIS光谱揭示的最长波长吸收带(λ的稳定红移最大)作为供体-受体共轭路径的数目在从双-芳基化的变化增加(11,44,和46),以四-芳基化(14 ,31和35)TEE。还发现最长波长吸收的位置强烈依赖于R 2 NC 6 H 4中N-取代基的性质。-捐助团体。电子发射光谱研究表明,供体-受体取