title: Fused corrole dimers interconvert between nonaromatic and aromatic states through two-electron redox reactions.
abstract: A singly linked corrole dimer was synthesized by condensation of a dipyrromethane-1-carbinol with 1,1,2,2-tetrapyrroethane. Oxidation of the dimer gave doubly linked corrole dimers 9 and 10 as the first examples of fused corrole dimers involving a meso-meso linkage. Dimers 9 and 10 exhibit characteristic (1)H NMR spectra, absorption spectra, excited-state dynamics, and two-photon absorption (TPA) values, which indicate the nonaromatic nature of 9 and the aromatic nature of 10. Interestingly, 9 is fairly stable despite its unusual 2H-corrole structure, which has been ascribed to the presence of two direct connections between the individual corrole units.
authors.affiliation: Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502 (Japan).
authors.forename: Shota
authors.initials: S
authors.lastname: Ooi
authors.forename: Takayuki
authors.initials: T
authors.lastname: Tanaka
authors.forename: Kyu Hyung
authors.initials: KH
authors.lastname: Park
authors.forename: Sangsu
authors.initials: S
authors.lastname: Lee
authors.forename: Dongho
authors.initials: D
authors.lastname: Kim
authors.forename: Atsuhiro
authors.initials: A
authors.lastname: Osuka
keywords: absorption; aromaticity; conjugation; dimerization; porphyrinoids