NDLI: Submillisecond-lived photoinduced charge separation in inclusion complexes composed of Li<sup>+</sup>@C<sub>60</sub> and cyclic porphyrin dimers

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Chemical Science Vol - 4 Issue - 3

Chemical Science Vol - 4 Issue - 2

Chemical Science Vol -3

Chemical Science Vol -2

Chemical Science Vol -1

Submillisecond-lived photoinduced charge separation in inclusion complexes composed of Li⁺@C₆₀ and cyclic porphyrin dimers

Content Provider	Royal Society of Chemistry (RSC)
Author	Nobukuni, Hirofumi Tani, Fumito Fukuzumi, Shunichi Kawashima, Yuki Kamimura, Takuya Ohkubo, Kei Naruta, Yoshinori
Copyright Year	2013
Abstract	Lithium ion encapsulated [60]fullerene (Li+@C60) is included within a free base and nickel complex of a cyclic porphyrin dimer (M-CPDPy, M = H4 and Ni2) to afford supramolecules (Li+@C60⊂M-CPDPy) in a polar solvent (benzonitrile) with the association constants of 2.6 × 105 M−1 and 3.5 × 105 M−1, respectively. From the electrochemical analysis, the energies of the charge-separated (CS) states are estimated to be 1.07 eV for Li+@C60⊂H4-CPDPy and 1.20 eV for Li+@C60⊂Ni2-CPDPy. Both values are lower than the triplet excited energies of the fullerene and porphyrin. Upon the photoexcitation at the Q-band of the porphyrin chromophore of Li+@C60⊂H4-CPDPy, electron transfer from the triplet excited state of the free base porphyrin to Li+@C60 occurs to produce the CS state. Li+@C60⊂Ni2-CPDPy also undergoes photoinduced electron transfer to produce the CS state. The lifetimes of the resulting CS states are 0.50 ms for Li+@C60⊂H4-CPDPy and 0.67 ms for Li+@C60⊂Ni2-CPDPy. These remarkably long CS lifetimes are the best values ever reported for non-covalent porphyrin-fullerene supramolecules in solution and are attributable to the lower CS energies than the triplet energy of each chromophore.
Starting Page	1451
Ending Page	1461
Page Count	11
File Format	HTM / HTML PDF
ISSN	20416520
Volume Number	4
Issue Number	4
Journal	Chemical Science
DOI	10.1039/c3sc22065f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Photoinduced electron transfer Electronvolt Lithium Ion Protein dimer Benzonitrile Fullerene Porphyrin Electrochemistry Free base Nickel Solvent Photoexcitation Chromophore
Content Type	Text
Resource Type	Article
Subject	Chemistry

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