Intramolecular Energy and Electron Transfers in Bodipy Naphthalenediimide Triads
Gobeze, Habtom B.
Mohammed, Omar F.
KAUST DepartmentChemical Science Program
KAUST Solar Center (KSC)
Physical Science and Engineering (PSE) Division
Ultrafast Laser Spectroscopy and Four-dimensional Electron Imaging Research Group
Online Publication Date2018-07
Print Publication Date2018-07-26
Permanent link to this recordhttp://hdl.handle.net/10754/630752
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AbstractBorondipyrromethene (BDP) naphthalenediimide (NDI) triads (BDP-NDI) and diiodo-BDP derivative (DiiodoBDP-NDI)) were synthesized to study the Förster resonance energy transfer (FRET) and its impact on the triplet state formation and dynamics. In these triads, diiodo-BDP and BDP are the energy donors and NDI is the energy acceptor. Nanosecond transient absorption spectra of triads indicated that triplet state is localized on NDI moiety, either by selective photoexcitation of the Diiodo-BDP or NDI unit. The intersystem crossing (ISC) is attributed to intramolecular heavy atom effect. The triplet state quantum yield was found to be 54% with a lifetime of 38 μs. However, no triplet state is observed for BDP-NDI system either by exciting BDP or NDI unit. Thus, we confirmed that charge recombination does not produce a triplet state. Interestingly, DiiodoBDP-NDI can be used as broadband excitable (500-620 nm) triplet photosensitizer, and high triplet-triplet annihilation (TTA) upconversion quantum yield of ΦUC = 2.8% was observed with 9,10-bis(phenylethynyl)-anthracene (BPEA) as a triplet acceptor/emitter.
CitationHussain M, El-Zohry AM, Gobeze HB, Zhao J, D’Souza F, et al. (2018) Intramolecular Energy and Electron Transfers in Bodipy Naphthalenediimide Triads. The Journal of Physical Chemistry A 122: 6081–6088. Available: http://dx.doi.org/10.1021/acs.jpca.8b03884.
SponsorsWe thank the NSFC (21473020, 21673031, 21761142005, 21603021, 21273028, and 21421005), the Fundamental Research Funds for the Central Universities (DUT16TD25, DUT15ZD224, and DUT2016TB12), and the State Key Laboratory of Fine Chemicals (ZYTS201801) for financial support.
PublisherAmerican Chemical Society (ACS)