Multiple conformational changes of p-tetraphenyl meso-hexakis(pentafluorophenyl) substituted [26] and [28]hexaphyrins(1.1.1.1.1.1)

摘要

β-Tetraphenyl meso-hexakis(pentafluorophenyl) substituted [26]hexaphyrin 3 is conformationally flexible between rectangular and figure-of-eight shapes and its two-electron reduced [28]hexaphyrin 4 takes figure-of-eight conformations, which are changed, upon protonation, to twisted conformations with distinct Moebius aromaticity. Increasing attention has been focused on expanded porphyrins that are conjugated macrocycles consisting of more than five pyrrolic subunits because of their diverse intriguing electrochemical, optical, structural, and coordination properties.