Substituent-sensitive fluorescence of sequentially N-alkylated tetrabenzotetraaza[8]circulenes

Gleb V. Baryshnikov, Rashid R. Valiev, Boris F. Minaev, Hans Ågren

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


We explore the use of substituent-sensitive balance between fluorescence and non-radiative decay as a tool for optical tuning of promising materials for organic light emitting diode applications. A series of N-butylated tetrabenzotetraaza[8]circulenes is studied computationally in order to explain the gradual decrease of fluorescence intensity with the increase of the substituent number. The inter-system crossing probability is found to increase upon the gradual substitution of the circulene macrocycle as a result of the decrease of the S1-T1 energy gap due to the deformation of the tetrabenzotetraaza[8]circulenes and therefore the distortion of the π-conjugation within the macrocycles. In contrast, the S1-T1 spin-orbit coupling matrix elements are quite insensitive to the number of outer substituents. As a result, the fluorescence-responsible ππ∗ transition becomes less intense and the fluorescence rate constant decreases.

Original languageEnglish
Pages (from-to)7621-7625
Number of pages5
JournalNew Journal of Chemistry
Issue number15
Publication statusPublished - 2017

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Substituent-sensitive fluorescence of sequentially N-alkylated tetrabenzotetraaza[8]circulenes'. Together they form a unique fingerprint.

Cite this