5-Thiaporphyrinium cation: effect of sulphur incorporation on excited state dynamics

Asahi Takiguchi, Naoto Inai, Seongsoo Kang, Masaya Hagai, Seokwon Lee, Takeshi Yanai, Dongho Kim, Hiroshi Shinokubo

Research output: Contribution to journalArticlepeer-review


We synthesised thionium-ion embedded aromatic porphyrinoids: a free-base 5-thiaporphyrinium cation and its zinc complex. The sulphur atom effectively participates in the macrocyclic π-conjugation. Fluorescence quantum yields of thiaporphyrinium cations were lower than 1% unlike oxaporphyrinium cations. Detailed photophysical analysis and DFT calculations clarified the vibrational mode regarding the out-of-plane motion of the sulphur atom induced ultrafast quenching of the excited state in comparison to the corresponding oxaporphyrinium cations.

Original languageEnglish
JournalChemical Communications
Publication statusAccepted/In press - 2022

Bibliographical note

Publisher Copyright:
© 2022 The Royal Society of Chemistry

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry


Dive into the research topics of '5-Thiaporphyrinium cation: effect of sulphur incorporation on excited state dynamics'. Together they form a unique fingerprint.

Cite this