1968 Volume 41 Issue 12 Pages 2849-2852
The longest wavelength electronic absorption band of 1-(p-substituted phenyl)pyrrole has been found to show a regular bathochromic shift as the electronegativity of the substituent on the phenyl group increases. The substituent effect is closely related to that for the intramolecular charge-transfer bands of p-substituted anilines. Therefore, the longest wavelength absorption band of 1-(p-substituted phenyl)pyrroles have been suggested to be originated from an electron transfer from the pyrryl group to the phenyl group. Only one exception is the spectra of 1-(N,N-dimethyl-p-aminophenyl)pyrrole. In this case, the longest wavelength electronic absorption band is suggested to be due to an electron-transfer from the N,N-dimethylamino group to the phenyl group.
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