Fused corrole dimers interconvert between nonaromatic and aromatic states through two-electron redox reactions.
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.
['Ooi|Shota|S|', 'Tanaka|Takayuki|T|', 'Park|Kyu Hyung|KH|', 'Lee|Sangsu|S|', 'Kim|Dongho|D|', 'Osuka|Atsuhiro|A|']
dimerization aromaticity absorption conjugation porphyrinoids