Communication
Porphyrinoids with 26 π Electrons: Molecules with Exceptional Spectroscopic Properties
First published: 21 March 2000
Citations: 17
This work was supported by the Fonds der Chemischen Industrie.
Graphical Abstract
Record extinctions ε of 1.6×106 and 1.0×106 for the UV/Vis Soret bands, as well as extreme chemical shifts for the inner and outer perimeter protons in the 1H NMR spectra, characterize the two closely related 26π porphyrinoids 1 and 2, respectively. The dichotomy that 1 and 2 differ markedly in the extinctions of the Soret bands (appearing at nearly the same wavelength) yet almost agree—within the limits of comparison—in the 1H NMR spectra is explained convincingly on the basis of the molecular structures of the two compounds.
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