New push–push–pull chromophores based on isomeric imidazo[5,1,2-cd]indolizines and naphtho[1′,2′:4,5]imidazo[1,2-a]pyridines were prepared. In the case of chromophores with strong NMe₂ or NPh₂ donors, strong intramolecular charge transfer (ICT) occurs leading to fluorescence emission quenching in polar solvents. DFT and TD-DFT calculations offer explanations to the observed photophysical data.

中文翻译：

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基于咪唑并[5,1,2-cd]吲哚并萘并[1'，2'：4,5]咪唑并[1,2-a]吡啶的推挽发色团的合成及光学性质

制备了新的基于咪唑并[5,1,2- cd ]吲哚并萘和萘并[1 '，2 '：4,5]咪唑并[1,2- a ]吡啶的推挽发色团。在具有强NMe ₂或NPh ₂供体的生色团的情况下，发生强分子内电荷转移（ICT），导致极性溶剂中的荧光发射猝灭。DFT和TD-DFT计算为观察到的光物理数据提供了解释。