Triplet-Triplet Energy Transfer Study in Hydrogen Bonding Systems.
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 × 10(4) s(-1), ΦTTET = 94.0%) than intermolecular triplet energy transfer (kTTET = 6.0 × 10(4) s(-1), ΦTTET = 90.9%), but slower and less efficient than intramolecular triplet energy transfer (kTTET > 10(8) s(-1)). These results are valuable for designing self-assembly triplet photosensitizers and for the study of the TTET process of hydrogen bonding systems.
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.
Zhijia
Z
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. zhaojzh@dlut.edu.cn.
Jianzhang
J
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.
Song
S
Guo