TY - JOUR
T1 - Intramolecular Energy and Electron Transfers in Bodipy Naphthalenediimide Triads
AU - Hussain, Mushraf
AU - El-Zohry, Ahmed
AU - Gobeze, Habtom B.
AU - Zhao, Jianzhang
AU - D’Souza, Francis
AU - Mohammed, Omar F.
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: We 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.
PY - 2018/7
Y1 - 2018/7
N2 - Borondipyrromethene (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.
AB - Borondipyrromethene (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.
UR - http://hdl.handle.net/10754/630752
UR - https://pubs.acs.org/doi/10.1021/acs.jpca.8b03884
UR - http://www.scopus.com/inward/record.url?scp=85049524403&partnerID=8YFLogxK
U2 - 10.1021/acs.jpca.8b03884
DO - 10.1021/acs.jpca.8b03884
M3 - Article
C2 - 29961320
AN - SCOPUS:85049524403
VL - 122
SP - 6081
EP - 6088
JO - The Journal of Physical Chemistry A
JF - The Journal of Physical Chemistry A
SN - 1089-5639
IS - 29
ER -