<i>m</i>‑Phenylene-Linked Dipyrrins and Their Boron–Difluoride Complexes as Variously Shaped Macrocyclic Oligomers UchidaJunji NakamuraTakashi YamamuraMasaki YamaguchiGento NabeshimaTatsuya 2016 The effectiveness of a <i>m</i>-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 <sup>1</sup>H 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.