Strong Charge-Transfer Chromophores from [2+2] Cycloadditions of TCNE and TCNQ to Peripheral Donor-Substituted Alkynes
作者:Songhua Chen、Yongjun Li、Chao Liu、Wenlong Yang、Yuliang Li
DOI:10.1002/ejoc.201101009
日期:2011.11
7,8,8-tetracyanoquinodimethane (TCNQ) to afford the charge-transfer chromophores 3–8. X-ray crystallographic analysis revealed the nonplanarity of these donor–acceptor (D–A) chromophores. Cyclic voltammetry (CV) exhibited a multistep reduction wave. UV/Vis spectra and theoretical calculations identified efficient intramolecular charge-transfer interactions. Moreover, scanning electron microscopy (SEM)
外围供体取代的 N,N-二甲基-4-[(7-nitrobenzo[c][1,2,5]thiadiazol-4-yl)ethynyl]aniline (1a), 4-(benzo[c][1, 2,5]噻二唑-4-基乙炔基)-N,N-二甲基苯胺(1b)和4,4'-苯并[c][1,2,5]噻二唑-4,7-二基双(乙炔-2, 1-diyl)}bis(N,N-二甲基苯胺) (2) 是通过 Sonogashira 交叉偶联反应制备的。化合物 1a、1b 和 2 随后与四氰基乙烯 (TCNE) 或 7,7,8,8-四氰基醌二甲烷 (TCNQ) 反应,得到电荷转移发色团 3-8。X 射线晶体学分析揭示了这些供体-受体 (D-A) 发色团的非平面性。循环伏安法 (CV) 表现出多步还原波。UV/Vis 光谱和理论计算确定了有效的分子内电荷转移相互作用。而且,