Potential-Dependent Adsorption of Amphoteric Rhodamine Dyes at the Oil/Water Interface as Studied by Potential-Modulated Fluorescence Spectroscopy

DOI Web Site 被引用文献14件
  • Toshiyuki Osakai
    Department of Chemistry, Graduate School of Science, Kobe University, Nada, Kobe 657-8501, Japan, and Department of Applied Chemistry, Faculty of Engineering, Nagasaki University, Bunkyo, Nagasaki 852-8521, Japan
  • Hiroshi Yamada
    Department of Chemistry, Graduate School of Science, Kobe University, Nada, Kobe 657-8501, Japan, and Department of Applied Chemistry, Faculty of Engineering, Nagasaki University, Bunkyo, Nagasaki 852-8521, Japan
  • Hirohisa Nagatani
    Department of Chemistry, Graduate School of Science, Kobe University, Nada, Kobe 657-8501, Japan, and Department of Applied Chemistry, Faculty of Engineering, Nagasaki University, Bunkyo, Nagasaki 852-8521, Japan
  • Takamasa Sagara
    Department of Chemistry, Graduate School of Science, Kobe University, Nada, Kobe 657-8501, Japan, and Department of Applied Chemistry, Faculty of Engineering, Nagasaki University, Bunkyo, Nagasaki 852-8521, Japan

書誌事項

公開日
2007-06-14
DOI
  • 10.1021/jp0723315
公開者
American Chemical Society (ACS)

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説明

Ion transfer and adsorption of amphoteric rhodamines, that is, Rhodamine B (RB), Rhodamine 19 (R19), and Rhodamine 110 (R110), and a cationic rhodamine, Rhodamine 123 (R123), at a polarized 1,2-dichloroethane/water (DCE/W) interface, were studied by means of cyclic voltammetry and potential-modulated fluorescence (PMF) spectroscopy. For all rhodamines, a well-defined voltammetric wave was obtained and the pH dependence of the reversible half-wave potential (i.e., midpoint potential) was investigated to prepare the ionic partition diagram. Theoretical considerations of the diagrams showed that the voltammetric waves obtained for the amphoteric rhodamines were not due to a simple transfer of the protonated form (R+) but due to the transfer of H+ facilitated by the amphoteric form (R±) in DCE (and partly in W for R110):  H+(W) + R±(DCE or W) → R+(DCE). In PMF spectroscopy, the PMF signal due to the adsorption of R+ at the interface could be obtained for RB, R19, and R123, only when the Galvani potential diff...

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