Triplet–Triplet Energy Transfer Study in Hydrogen Bonding Systems

Authors

  • Zhijia Wang State Key Laboratory of Fine Chemicals School of Chemical Engineering Dalian University of Technology E-208 West Campus, 2 Ling-Gong Road Dalian 116024, P.R. China
  • Jianzhang Zhao State Key Laboratory of Fine Chemicals School of Chemical Engineering Dalian University of Technology E-208 West Campus, 2 Ling-Gong Road Dalian 116024, P.R. China. zhaojzh@dlut.edu.cn
  • Song Guo State Key Laboratory of Fine Chemicals School of Chemical Engineering Dalian University of Technology E-208 West Campus, 2 Ling-Gong Road Dalian 116024, P.R. China

DOI:

https://doi.org/10.2533/chimia.2015.524

Keywords:

Bodipy, Hydrogen bond, Intermolecular/intramolecular ttet, Supramolecular

Abstract

The 2,6-diiodoBodipy–styrylBodipy hydrogen bonding system was prepared to study the effect of hydrogen bonding on the triplet–triplet-energy-transfer (TTET) process. 2,6-DiiodoBodipy linked with N-acetyl-2,6-diaminopyridine (D-2) was used as the triplet energy donor, and the styrylBodipy connected with thymine (A-1) was used as triplet energy acceptor, thus the TTET process was established upon photoexcitation. The photophysical processes of the hydrogen bonding system were studied with steady-state UV-vis absorption spectroscopy, fluorescence spectroscopy, fluorescence lifetime measurement and nanosecond time-resolved transient absorption spectroscopies. The TTET of the intramolecular/hydrogen bonding/intermolecular systems were compared through nanosecond transient absorption spectroscopy. The TTET process of the hydrogen bonding system is faster and more efficient (kTTET = 6.9 × 104 s–1, ?TTET = 94.0%) than intermolecular triplet energy transfer (kTTET = 6.0 × 104 s–1, ?TTET = 90.9%), but slower and less efficient than intramolecular triplet energy transfer (kTTET > 108 s–1). These results are valuable for designing self-assembly triplet photosensitizers and for the study of the TTET process of hydrogen bonding systems.

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Published

2015-09-30

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Scientific Articles