Synthesis of donor–acceptor chromophores by the [2 + 2] cycloaddition of arylethynyl-2H-cyclohepta[b]furan-2-ones with 7,7,8,8-tetracyanoquinodimethane
作者:Taku Shoji、Junya Higashi、Shunji Ito、Tetsuo Okujima、Masafumi Yasunami、Noboru Morita
DOI:10.1039/c2ob06931h
日期:——
formal [2 + 2] cycloaddition reaction, followed by ring opening of the initially formed cyclobutene derivatives, to afford the corresponding dicyanoquinodimethane (DCNQ) chromophores in excellent yields. The intramolecular charge-transfer (ICT) interactions between the 2H-cyclohepta[b]furan-2-one ring and DCNQ acceptor moiety were investigated by UV/Vis spectroscopy and theoretical calculations. The
芳乙炔基-2 H-环庚[ b ]呋喃-2-酮与7,7,8,8-四氰基喹二甲烷(TCNQ)在正式的[2 + 2]环加成反应中,然后将最初形成的环丁烯衍生物开环,以极好的收率得到相应的二氰基喹二甲烷(DCNQ)发色团。通过紫外/可见光谱和理论计算研究了2 H-环庚[ b ]呋喃-2-酮环与DCNQ受体部分之间的分子内电荷转移(ICT)相互作用。通过循环伏安法(CV)和微分脉冲伏安法(DPV)检查了新型DCNQ衍生物的氧化还原行为,发现它们的多步电化学还原性能取决于分子中DCNQ单元的数量。此外,通过可见光谱在电化学还原条件下观察到显着的颜色变化。