<i>N</i>-Aryl substituents have an influence on the photophysics of tetraaryl-pyrrolo[3,2-<i>b</i>]pyrroles.

ABSTRACT: The photophysics of two series of 1,4-dihydro-tetraaryl-pyrrolo[3,2-b]pyrroles possessing N-aryl substituents with various electronic characteristics was investigated systematically. The molecular structure of these compounds was designed so that their solubility enabled us to study their absorption and emission in a broad range of solvents. The presence of N-4-nitrophenyl substituents is responsible for a weak charge-transfer absorption band and shifts the emission band hypsochromically. At the same time, their presence quenches fluorescence; although if electron-withdrawing substituents are present at positions 2 and 5, this effect is reduced by an order of magnitude. In the case of less electron-withdrawing N-4-cyanophenyl and N-3-cyanophenyl groups, s

SUBMITTER: Petrykowski WD 

PROVIDER: S-EPMC12771474 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature