Sequential N-Alkylations of Tetrabenzotetraaza[8]circulene as a Tool To Tune Its Optical Properties

Fengkun Chen, Yong Seok Hong, Dongho Kim, Takayuki Tanaka, Atsuhiro Osuka

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3 Citations (Scopus)


Sequential N-alkylations of tetrabenzotetraaza[8]circulene provided mono-, di-, tri, and tetra-N-alkylated products in a controlled manner. Curiously, only opp isomer was obtained as a di-N-alkylated product. Upon increase of the N-alkyl groups, the absorption and emission spectra exhibit continuous red-shifts, and the excited-state lifetimes become shortened, probably because of increased steric congestion at the nitrogen atoms that causes the central core to deviate from planarity. Mixed N-substituted [8]circulenes have been also prepared.

Original languageEnglish
Pages (from-to)1048-1051
Number of pages4
Issue number7
Publication statusPublished - 2017 Aug 1


All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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