AN*)]; (ii) a pH- and metal coordination-induced electron transfer from the photoexcited AN to the ground-state BP [ELT(AN*-->BP)]; and (iii) a Cu2+ coordination-induced energy transfer from the photoexcited AN to Cu2+ [ENT(AN*-->Cu2+)]." />
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Nishimura G, Ishizumi K, Shiraishi Y, et al. A triethylenetetramine bearing anthracene and benzophenone as a fluorescent molecular logic gate with either-or switchable dual logic functions. J Phys Chem B. 2006;110(43):21596-602doi: 10.1021/jp064131j.
Nishimura, G., Ishizumi, K., Shiraishi, Y., & Hirai, T. (2006). A triethylenetetramine bearing anthracene and benzophenone as a fluorescent molecular logic gate with either-or switchable dual logic functions. The journal of physical chemistry. B, 110(43), 21596-602. https://doi.org/10.1021/jp064131j
Nishimura, Go, et al. "A triethylenetetramine bearing anthracene and benzophenone as a fluorescent molecular logic gate with either-or switchable dual logic functions." The journal of physical chemistry. B vol. 110,43 (2006): 21596-602. doi: https://doi.org/10.1021/jp064131j
Nishimura G, Ishizumi K, Shiraishi Y, Hirai T. A triethylenetetramine bearing anthracene and benzophenone as a fluorescent molecular logic gate with either-or switchable dual logic functions. J Phys Chem B. 2006 Nov 02;110(43):21596-602. doi: 10.1021/jp064131j. PMID: 17064114.
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J Phys Chem B. 2006 Nov 02;110(43):21596-602. doi: 10.1021/jp064131j.

A triethylenetetramine bearing anthracene and benzophenone as a fluorescent molecular logic gate with either-or switchable dual logic functions.

The journal of physical chemistry. B

Go Nishimura, Katsutake Ishizumi, Yasuhiro Shiraishi, Takayuki Hirai

Affiliations

  1. Research Center for Solar Energy Chemistry and Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University, Toyonaka 560-8531, Japan.

PMID: 17064114 DOI: 10.1021/jp064131j

Abstract

Fluorescence behaviors of a triethylenetetramine bearing anthracene (AN) and benzophenone (BP) fragments at the respective ends, L1, have been studied in water, where effects of pH (H+) and metal cations on the emission properties have been studied in detail. L1 behaves as a fluorescent molecular logic gate driven by H+ (Input1) and metal cations (Input2) as input chemicals. The most notable feature of L1 is that this molecule expresses the "either-or" switchable dual logic functions. Operation of L1 with Cu2+ as Input2 expresses the INHIBIT logic function, where a strong AN fluorescence appears only at pH 4 (with H+) without Cu2+ [Input1(1)-Input2(0)]. In contrast, operations of L1 with all other metal cations as Input2 express the TRANSFER logic function, where the presence of H+ allows strong AN fluorescence regardless of whether the metal cation exists or not [Input1(1)-Input2(0); Input1(1)-Input2(1)]. These emission switching behaviors of L1 are driven by the difference in the coordination stability between L1 and metal cations and the photoinduced intramolecular electron and energy transfer processes: (i) a pH-induced electron transfer from unprotonated nitrogen atoms of the polyamine chain to the photoexcited AN [ELT(N-->AN*)]; (ii) a pH- and metal coordination-induced electron transfer from the photoexcited AN to the ground-state BP [ELT(AN*-->BP)]; and (iii) a Cu2+ coordination-induced energy transfer from the photoexcited AN to Cu2+ [ENT(AN*-->Cu2+)].

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