<i>m</i>‑Phenylene-Linked Dipyrrins and Their Boron–Difluoride Complexes as Variously Shaped Macrocyclic Oligomers

The effectiveness of a m-phenylene linker, which has rigidity as well as rotational flexibility, is presented to produce a series of variously shaped macrocyclic oligomers of dipyrrins and BODIPYs, whose structures were revealed by X-ray crystallography and 1H NMR analysis. Although the chemical structures of the repeating units are the same for dipyrrin/BODIPY oligomers, their absorbance and emission properties changed significantly depending on the size and shape of the macrocycles.本文报道了兼具刚性与旋转柔性的间亚苯基连接基（m-phenylene linker）的应用效果，借此制备了一系列结构各异的二吡咯烯（dipyrrins）与氟化硼二吡咯（BODIPYs）大环低聚物，其结构通过X射线晶体学（X-ray crystallography）与核磁共振氢谱（1H NMR）分析得以解析。尽管二吡咯烯/氟化硼二吡咯低聚物的重复单元化学结构完全一致，但其吸收与发射性能却随大环的尺寸与形态发生了显著变化。