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Supramolecular structures and photoelectronic properties of the inclusion complex of a cyclic free-base porphyrin dimer and C60

Title
Supramolecular structures and photoelectronic properties of the inclusion complex of a cyclic free-base porphyrin dimer and C60
Authors
Nobukuni H.Shimazaki Y.Uno H.Naruta Y.Ohkubo K.Kojima T.Fukuzumi S.Seki S.Sakai H.Hasobe T.Tani F.
Ewha Authors
Shunichi Fukuzumi
SCOPUS Author ID
Shunichi Fukuzumiscopus
Issue Date
2010
Journal Title
Chemistry - A European Journal
ISSN
0947-6539JCR Link
Citation
vol. 16, no. 38, pp. 11611 - 11623
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
A cyclic free-base porphyrin dimer H4-CPDPy (CPD = cyclic porphyrin dimer) linked by butadiyne moieties bearing 4-pyridyl groups self-assembles to form a novel porphyrin nanotube in the crystalline state. The cyclic molecules link together through nonclassical C-H···N hydrogen bonds and π-π interactions of the pyridyl groups along the crystallographic a axis. H4-CPDPy includes a C 60 molecule in its cavity in solution. In the crystal structure of the inclusion complex (C60⊂H4-CPDPy), the dimer "bites" a C60 molecule by tilting the porphyrin rings with respect to each other, and there are strong π-π interactions between the porphyrin rings and C60. The included C60 molecules form a zigzag chain along the crystallographic b axis through van der Waals contacts with each other. Femtosecond laser flash photolysis of C 60⊂H4-CPDPy in the solid state with photoexcitation at 420 nm shows the formation of a completely charge-separated state {H4-CPDPy •+ + C60 •-}, which decays with a lifetime of 470 ps to the ground state. The charge-carrier mobility of the single crystal of C60⊂H 4-CPDPy was determined by flash photolysis time-resolved microwave conductivity (FP-TRMC) measurements. C60cH 4-CPDPy has an anisotropic charge mobility (σμ = 0.16 and 0.13cm 2V-1s-1) along the zigzag chain of C60 (which runs at 45° and parallel to the crystallographic b axis). To construct a photoelectrochemical cell, C60⊂H 4-CPDPy was deposited onto nanostructured SnO2 films on a transparent electrode. The solar cell exhibited photovoltaic activity with an incident photon to current conversion efficiency of 17 %. © 2010 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
DOI
10.1002/chem.201001815
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자연과학대학 > 화학·나노과학전공 > Journal papers
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