Donor-Substituted Perethynylated Dehydroannulenes and Radiaannulenes: Acetylenic Carbon Sheets Featuring Intense Intramolecular Charge Transfer
作者:Frieder Mitzel、Corinne Boudon、Jean-Paul Gisselbrecht、Paul Seiler、Maurice Gross、François Diederich
DOI:10.1002/hlca.200490104
日期:2004.5
investigations (Table) demonstrated that the radiaannulenes are particularly powerful electron acceptors. Thus, bicyclic radiaannulene 11, which possesses eight peripheral 3,5-di(tert-butyl)phenyl substituents, is reversibly reduced at −0.83 V in THF (vs. Fc+/Fc), making it a better electron acceptor than buckminsterfullerene C60 under comparable conditions.
在本文中,我们报告了使用模块化四乙炔基乙烯(TEE,3,4-diethynylhex-3-ene-1,5-diyne)构建单元通过乙炔支架制备空前的π共轭大环(图1)。(Z)-双脱保护的TEE的新光化学途径(方案1)使得能够合成苯胺基取代的乙炔基化的十八氢[12]-(5)和十二氢[18]环戊烯(6)(方案2)。在偶然发现了乙炔基化的Radianannulenes(方案3)之后,可以将其视为乙炔化的脱氢环戊烯和膨胀的烯键的杂化物,随后出现了两个系列的单环(7 – 9 ; 制备了方案6)和双环(10和11;方案7)的代表。通过X射线晶体结构分析揭示了radiaannulene 7大环周界的大量应变(图2)。然而,单环和双环的环戊二烯在室温下在空气中稳定数月。通过引入外围苯胺基供体基团,与电子接受的全C核经历强分子内电荷转移相互作用,可以大大提高脱氢环戊烯和放射性环戊烯的光电性能。结果,UV /