Donor-Substituted Cyanoethynylethenes: π-Conjugation and Band-Gap Tuning in Strong Charge-Transfer Chromophores
作者:Nicolle N. P. Moonen、William C. Pomerantz、Robin Gist、Corinne Boudon、Jean-Paul Gisselbrecht、Tsuyoshi Kawai、Atsushi Kishioka、Maurice Gross、Masahiro Irie、François Diederich
DOI:10.1002/chem.200500082
日期:2005.5.20
combination of 13C NMR spectroscopic and electrochemistry measurements. Donor-substituted CEEs display strong intramolecular charge-transfer (CT) character, resulting in intense, bathochromically shifted CT bands in the UV/Vis spectrum. Their structural diversity establishes them as suitable models for the study of pi-conjugation and band gap tuning in strong charge-transfer chromophores. The extent of pi-conjugation
合成了一系列广泛的甲硅烷基保护的氰基乙炔(CEE)和N,N-二甲基苯胺基供体取代的CEE。通过选择性的甲硅烷基脱保护和随后的氧化炔键偶联,可以构建更多的发色团。通过13 C NMR光谱学和电化学测量的结合揭示了CEE的强电子接受性质。供体取代的CEE表现出很强的分子内电荷转移(CT)特性,导致在UV / Vis光谱中出现强烈的红移的CT带。它们的结构多样性使它们成为研究强电荷转移生色团的π共轭和能带隙调谐的合适模型。通过结合基态技术研究了供体取代的CEE中pi共轭的程度,例如X射线晶体学,电化学,B3 LYP计算和NMR光谱学。将这些基态结果与在UV / Vis光谱中观察到的特征进行比较后发现,与预期相反,更广泛的pi共轭可导致具有强供体和受体部分的分子带隙更大。