Indexed by:期刊论文

Date of Publication:2015-07-01

Journal:CHIMIA

Included Journals:SCIE、PubMed、Scopus

Volume:69

Issue:9

Page Number:524-529

ISSN No.:0009-4293

Key Words: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 (k(TTET) = 6.9 x 10(4) s(-1), Phi(TTET) = 94.0%) than intermolecular triplet energy transfer (k(TTET) = 6.0 x 10(4) s(-1), Phi(TTET) = 90.9%), but slower and less efficient than intramolecular triplet energy transfer (k(TTET) > 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.