Zwitterionic Corroles: Regioselective Nucleophilic Pyridination of a Doubly Linked Biscorrole†
This work was partly supported by Grants‐in‐Aid for Scientific Research (nos. 18685013, 19205006, and 20037034) from the Ministry of Education, Culture, Sports, Science, and Technology (Japan). H.S. acknowledges Ogasawara Science Foundation for financial support. S.H. acknowledges the Research Fellowships of the JSPS for Young Scientists.
Abstract
Pyridine attacks: Nucleophilic addition of pyridine derivatives to a doubly linked corrole, which is a stable singlet biradical species, occurs at the bay area with high regioselectivity to provide zwitterionic dimers (see picture; Ar=C6F5). Charge transfer between the anionic corrole and the pyridinium groups induces effective fluorescence quenching of the corrole dimer, which can be utilized for selective fluoride ion recognition.
