Multiple photosynthetic reaction centers composed of supramolecular assemblies of a zinc porphyrin dendrimer with pyridylnaphthalenediimide

Shunichi Fukuzumi; Kei Ohkubo; Kenji Saito; Yukiyasu Kashiwagi; Tony Khoury; Maxwell J. Crossley

doi:10.1142/S1088424611004178

Multiple photosynthetic reaction centers composed of supramolecular assemblies of a zinc porphyrin dendrimer with pyridylnaphthalenediimide

Shunichi Fukuzumi, Kei Ohkubo, Kenji Saito, Yukiyasu Kashiwagi, Tony Khoury, Maxwell J. Crossley

Department of Chemistry & Nanoscience

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

Multiple photosynthetic reaction centers have successfully been constructed using a supramolecular complex of zinc porphyrin dendrimer [D(ZnP) ₁₆] with pyridylnaphthalenediimide (PyNIm) in benzonitrile. The apparent formation constant determined from the fluorescence quenching of the singlet excited state of porphyrin moieties by PyNIm is significantly larger than that determined from the UV-vis spectral change. This indicates that efficient energy migration occurs between the porphyrin units of the dendrimer prior to the electron transfer from the singlet excited state of zinc porphyrin to PyNIm. The charge-separated (CS) state has been successfully detected as the transient absorption spectrum in the laser flash photolysis. The CS lifetime of in the supramolecular complex of D(ZnP)₁₆ with PyNIm was determined to be 0.83 ms at 298 K.

Original language	English
Pages (from-to)	1292-1298
Number of pages	7
Journal	Journal of Porphyrins and Phthalocyanines
Volume	15
Issue number	11-12
DOIs	https://doi.org/10.1142/S1088424611004178
State	Published - 2011

Bibliographical note

Funding Information:
This work was partially supported by a Grant in Aid (nos. 20108010 and 23750014) and a Global COE program, “the Global Education and Research Center for Bio-Environmental Chemistry” from the Ministry of Education, Culture, Sports, Science and Technology, Japan, KOSEF/MEST through WCU project (R31-2008-000-10010-0), Korea, and Discovery Research Grant (DP0208776) to M.J.C. from the Australian Research Council, Australia.

Keywords

artificial photosynthesis
charge separation
dendrimer
photoinduced electron transfer
pyridylnaphthalenediimide

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title = "Multiple photosynthetic reaction centers composed of supramolecular assemblies of a zinc porphyrin dendrimer with pyridylnaphthalenediimide",

abstract = "Multiple photosynthetic reaction centers have successfully been constructed using a supramolecular complex of zinc porphyrin dendrimer [D(ZnP) 16] with pyridylnaphthalenediimide (PyNIm) in benzonitrile. The apparent formation constant determined from the fluorescence quenching of the singlet excited state of porphyrin moieties by PyNIm is significantly larger than that determined from the UV-vis spectral change. This indicates that efficient energy migration occurs between the porphyrin units of the dendrimer prior to the electron transfer from the singlet excited state of zinc porphyrin to PyNIm. The charge-separated (CS) state has been successfully detected as the transient absorption spectrum in the laser flash photolysis. The CS lifetime of in the supramolecular complex of D(ZnP)16 with PyNIm was determined to be 0.83 ms at 298 K.",

keywords = "artificial photosynthesis, charge separation, dendrimer, photoinduced electron transfer, pyridylnaphthalenediimide",

author = "Shunichi Fukuzumi and Kei Ohkubo and Kenji Saito and Yukiyasu Kashiwagi and Tony Khoury and Crossley, {Maxwell J.}",

note = "Funding Information: This work was partially supported by a Grant in Aid (nos. 20108010 and 23750014) and a Global COE program, “the Global Education and Research Center for Bio-Environmental Chemistry” from the Ministry of Education, Culture, Sports, Science and Technology, Japan, KOSEF/MEST through WCU project (R31-2008-000-10010-0), Korea, and Discovery Research Grant (DP0208776) to M.J.C. from the Australian Research Council, Australia.",

year = "2011",

doi = "10.1142/S1088424611004178",

language = "English",

volume = "15",

pages = "1292--1298",

journal = "Journal of Porphyrins and Phthalocyanines",

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AU - Fukuzumi, Shunichi

AU - Ohkubo, Kei

AU - Saito, Kenji

AU - Kashiwagi, Yukiyasu

AU - Khoury, Tony

AU - Crossley, Maxwell J.

N1 - Funding Information: This work was partially supported by a Grant in Aid (nos. 20108010 and 23750014) and a Global COE program, “the Global Education and Research Center for Bio-Environmental Chemistry” from the Ministry of Education, Culture, Sports, Science and Technology, Japan, KOSEF/MEST through WCU project (R31-2008-000-10010-0), Korea, and Discovery Research Grant (DP0208776) to M.J.C. from the Australian Research Council, Australia.

PY - 2011

Y1 - 2011

N2 - Multiple photosynthetic reaction centers have successfully been constructed using a supramolecular complex of zinc porphyrin dendrimer [D(ZnP) 16] with pyridylnaphthalenediimide (PyNIm) in benzonitrile. The apparent formation constant determined from the fluorescence quenching of the singlet excited state of porphyrin moieties by PyNIm is significantly larger than that determined from the UV-vis spectral change. This indicates that efficient energy migration occurs between the porphyrin units of the dendrimer prior to the electron transfer from the singlet excited state of zinc porphyrin to PyNIm. The charge-separated (CS) state has been successfully detected as the transient absorption spectrum in the laser flash photolysis. The CS lifetime of in the supramolecular complex of D(ZnP)16 with PyNIm was determined to be 0.83 ms at 298 K.

AB - Multiple photosynthetic reaction centers have successfully been constructed using a supramolecular complex of zinc porphyrin dendrimer [D(ZnP) 16] with pyridylnaphthalenediimide (PyNIm) in benzonitrile. The apparent formation constant determined from the fluorescence quenching of the singlet excited state of porphyrin moieties by PyNIm is significantly larger than that determined from the UV-vis spectral change. This indicates that efficient energy migration occurs between the porphyrin units of the dendrimer prior to the electron transfer from the singlet excited state of zinc porphyrin to PyNIm. The charge-separated (CS) state has been successfully detected as the transient absorption spectrum in the laser flash photolysis. The CS lifetime of in the supramolecular complex of D(ZnP)16 with PyNIm was determined to be 0.83 ms at 298 K.

KW - artificial photosynthesis

KW - charge separation

KW - dendrimer

KW - photoinduced electron transfer

KW - pyridylnaphthalenediimide

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Multiple photosynthetic reaction centers composed of supramolecular assemblies of a zinc porphyrin dendrimer with pyridylnaphthalenediimide

Abstract

Bibliographical note

Keywords

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