Diarylamine-Fused Subporphyrins: Proof of Twisted Intramolecular Charge Transfer (TICT) Mechanism

Koki Kise, Yongseok Hong, Norihito Fukui, Daiki Shimizu, Dongho Kim, Atsuhiro Osuka

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Diarylamine-fused subporphyrins 1 a and 1 b were synthesized from β,β-diiodo-meso-chloro subporphyrin 2 through a one-pot procedure involving nucleophilic aromatic substitution and SRN1-type intramolecular fusion reaction as the first example of meso-nitrogen-embedded subporphyrin. While non-fused counterparts 3 b and 4 b display effective fluorescence quenching due to twisted intramolecular charge transfer (TICT) in CH2Cl2 at room temperature, 1 b emits fluorescence with ΦF=0.18 under the same conditions, because conformational twisting is not allowed due to the fused structure. In addition, the oxidative titration with tris(4-bromophenyl)ammoniumyl hexachloroantimonate gave cation radical 7 for 1 a and cation radical and dication for 1 b. Actually, cation radical 7 was isolated through separation over silica gel column but was found to slowly decompose in concentrated solutions.

Original languageEnglish
Pages (from-to)8306-8310
Number of pages5
JournalChemistry - A European Journal
Volume24
Issue number33
DOIs
Publication statusPublished - 2018 Jun 12

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Organic Chemistry

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