All-Aza meso-Benzo-Fused Triphyrins(2.1.1): Large Bathochromic Shift and Intensified Absorption via π‑Extended Conjugation

The topology that would be dependent on the effectiveness of π-electron coupling is significantly tuned by the strong conjugation that exists in fused systems. Side or linear fusion of unsaturated and conjugated hydrocarbons can have a significant effect on the π-electron cloud that is accessible in the final structure. The syntheses of three all-aza benzene-annulated triphyrins(2.1.1) were revealed. Because of the π extension, the lowest-energy Q band is not only red-shifted by more than 100 nm but also intensified to a great extent, indicating 18π-aromatic characteristics.依赖于π电子耦合（π-electron coupling）效果的拓扑结构，可通过稠合体系（fused systems）中存在的强共轭作用得到显著调控。不饱和共轭烃的侧向或直线稠合，会对最终结构中可及的π电子云产生显著影响。本研究成功合成了三种全氮杂苯稠合三卟啉(2.1.1)。由于π体系扩展，其最低能量的Q带不仅红移超过100 nm，还在很大程度上得到增强，这表明该化合物具有18π芳香性特征。