Effect of dual fullerenes on lifetimes of charge-separated states of subphthalocyanine - triphenylamine - fullerene molecular systems

Mohamed E. El-Khouly; Sun Hee Shim; Yasuyuki Araki; Osamu Ito; Kwang Yol Kay

doi:10.1021/jp7108658

Effect of dual fullerenes on lifetimes of charge-separated states of subphthalocyanine - triphenylamine - fullerene molecular systems

Mohamed E. El-Khouly, Sun Hee Shim, Yasuyuki Araki, Osamu Ito, Kwang Yol Kay

IMRAM - Division of Organic- and Biomaterials Research

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

52 Citations (Scopus)

Abstract

Photoinduced intramolecular electron-transfer events of the newly synthesized subphthalocyanine-tripheny-lamine-fullerene triad (SubPc-TPA-Co ₆₀) and subphthalocyanine-triphenylamine-bisfullerene tetrad (SubPc-TPA-(C₆₀)2) were studied. The geometric and electronic structures of the triad were probed by ab initio B3LYP/3-21G method, which predicts SubPc-TPA^.+-C₆₀^.- as a stable charge-separated state. The photoinduced events via the excited singlet state of SubPc were monitored by time-resolved emission measurements as well as transient absorption techniques. Efficient charge-separations via the excited states of SubPc were observed with the rates of ∼10¹⁰ s ^_1. Compared with the SubPc - TPA dyad, a long-lived charge-separated state was observed for the SubPc - TPA - C₆₀ triad with the lifetime of the radical ion pairs (τ_RIP) of 670 ns in benzonitrile. Interestingly, further charge stabilization was achieved in the charge-separated state of SubPc - TPA - (C₆₀)₂, in which the τ_RIP was found to be 1050 ns in benzonitrile.

Original language	English
Pages (from-to)	3910-3917
Number of pages	8
Journal	Journal of Physical Chemistry B
Volume	112
Issue number	13
DOIs	https://doi.org/10.1021/jp7108658
Publication status	Published - 2008 Apr 3

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title = "Effect of dual fullerenes on lifetimes of charge-separated states of subphthalocyanine - triphenylamine - fullerene molecular systems",

abstract = "Photoinduced intramolecular electron-transfer events of the newly synthesized subphthalocyanine-tripheny-lamine-fullerene triad (SubPc-TPA-Co 60) and subphthalocyanine-triphenylamine-bisfullerene tetrad (SubPc-TPA-(C60)2) were studied. The geometric and electronic structures of the triad were probed by ab initio B3LYP/3-21G method, which predicts SubPc-TPA.+-C60.- as a stable charge-separated state. The photoinduced events via the excited singlet state of SubPc were monitored by time-resolved emission measurements as well as transient absorption techniques. Efficient charge-separations via the excited states of SubPc were observed with the rates of ∼1010 s _1. Compared with the SubPc - TPA dyad, a long-lived charge-separated state was observed for the SubPc - TPA - C60 triad with the lifetime of the radical ion pairs (τRIP) of 670 ns in benzonitrile. Interestingly, further charge stabilization was achieved in the charge-separated state of SubPc - TPA - (C60)2, in which the τRIP was found to be 1050 ns in benzonitrile.",

author = "El-Khouly, {Mohamed E.} and Shim, {Sun Hee} and Yasuyuki Araki and Osamu Ito and Kay, {Kwang Yol}",

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AU - El-Khouly, Mohamed E.

AU - Shim, Sun Hee

AU - Araki, Yasuyuki

AU - Ito, Osamu

AU - Kay, Kwang Yol

PY - 2008/4/3

Y1 - 2008/4/3

N2 - Photoinduced intramolecular electron-transfer events of the newly synthesized subphthalocyanine-tripheny-lamine-fullerene triad (SubPc-TPA-Co 60) and subphthalocyanine-triphenylamine-bisfullerene tetrad (SubPc-TPA-(C60)2) were studied. The geometric and electronic structures of the triad were probed by ab initio B3LYP/3-21G method, which predicts SubPc-TPA.+-C60.- as a stable charge-separated state. The photoinduced events via the excited singlet state of SubPc were monitored by time-resolved emission measurements as well as transient absorption techniques. Efficient charge-separations via the excited states of SubPc were observed with the rates of ∼1010 s _1. Compared with the SubPc - TPA dyad, a long-lived charge-separated state was observed for the SubPc - TPA - C60 triad with the lifetime of the radical ion pairs (τRIP) of 670 ns in benzonitrile. Interestingly, further charge stabilization was achieved in the charge-separated state of SubPc - TPA - (C60)2, in which the τRIP was found to be 1050 ns in benzonitrile.

AB - Photoinduced intramolecular electron-transfer events of the newly synthesized subphthalocyanine-tripheny-lamine-fullerene triad (SubPc-TPA-Co 60) and subphthalocyanine-triphenylamine-bisfullerene tetrad (SubPc-TPA-(C60)2) were studied. The geometric and electronic structures of the triad were probed by ab initio B3LYP/3-21G method, which predicts SubPc-TPA.+-C60.- as a stable charge-separated state. The photoinduced events via the excited singlet state of SubPc were monitored by time-resolved emission measurements as well as transient absorption techniques. Efficient charge-separations via the excited states of SubPc were observed with the rates of ∼1010 s _1. Compared with the SubPc - TPA dyad, a long-lived charge-separated state was observed for the SubPc - TPA - C60 triad with the lifetime of the radical ion pairs (τRIP) of 670 ns in benzonitrile. Interestingly, further charge stabilization was achieved in the charge-separated state of SubPc - TPA - (C60)2, in which the τRIP was found to be 1050 ns in benzonitrile.

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Effect of dual fullerenes on lifetimes of charge-separated states of subphthalocyanine - triphenylamine - fullerene molecular systems

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