Ultrafast electron/energy transfer and intersystem crossing mechanisms in bodipy-porphyrin compounds

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TUTEL Y., Sevinç G., Küçüköz B., Yildiz E. A., Karatay A., Dumanoğulları F. M., ...Daha Fazla

Processes, cilt.9, sa.2, ss.1-11, 2021 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 9 Sayı: 2
  • Basım Tarihi: 2021
  • Doi Numarası: 10.3390/pr9020312
  • Dergi Adı: Processes
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1-11
  • Anahtar Kelimeler: borondipyrromethene, porphyrin, Forster resonance energy transfer, ultrafast pump-probe spectroscopy
  • Orta Doğu Teknik Üniversitesi Adresli: Hayır

Özet

© 2021 by the authors. Licensee MDPI, Basel, Switzerland.Meso-substituted borondipyrromethene (BODIPY)-porphyrin compounds that include free base porphyrin with two different numbers of BODIPY groups (BDP-TTP and 3BDP-TTP) were designed and synthesized to analyze intramolecular energy transfer mechanisms of meso-substituted BODIPY-porphyrin dyads and the effect of the different numbers of BODIPY groups connected to free-base porphyrin on the energy transfer mechanism. Absorption spectra of BODIPY-porphyrin conjugates showed wide absorption features in the visible region, and that is highly valuable to increase light-harvesting efficiency. Fluorescence spectra of the studied compounds proved that BODIPY emission intensity decreased upon the photoexcitation of the BODIPY core, due to the energy transfer from BODIPY unit to porphyrin. In addition, ultrafast pump-probe spectroscopy measurements indicated that the energy transfer of the 3BDP-TTP compound (about 3 ps) is faster than the BDP-TTP compound (about 22 ps). Since the BODIPY core directly binds to the porphyrin unit, rapid energy transfer was seen for both compounds. Thus, the energy transfer rate increased with an increasing number of BODIPY moiety connected to free-base porphyrin.