Direct spectroelectrochemical observation of interfacial species at the polarized water/1,2-dichloroethane interface by ac potential modulation technique

Nagatani, Hirohisa; Ozeki, Toru; Osakai, Toshiyuki

doi:10.1016/j.jelechem.2005.12.008

Cited by 22 publications

(39 citation statements)

References 20 publications

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“…A combination of the four-electrode potentiostat and a digital lock-in amplifier (NF LI 5640) was employed for the PMF measurements [12]. The amplitude of potential Fig.…”

Section: Potential-modulated Fluorescence (Pmf) Spectroscopymentioning

confidence: 99%

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Interfacial behavior of sulforhodamine 101 at the polarized water/1,2-dichloroethane interface studied by spectroelectrochemical techniques

et al. 2006

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The transfer mechanism of an amphoteric rhodamine, sulforhodamine 101 (SR101), across the polarized water/1,2-dichloroethane (DCE) interface was investigated using cyclic voltammetry, differential voltfluorometry and potential-modulated fluorescence (PMF) spectroscopy. The voltammetric response for the ion transfer of SR101 monoanion from water to DCE was observed as the diffusion-controlled transfer process. An unusual voltammetric response was found at 0.15 V more negative than the formal transfer potential of

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“…A combination of the four-electrode potentiostat and a digital lock-in amplifier (NF LI 5640) was employed for the PMF measurements [12]. The amplitude of potential Fig.…”

Section: Potential-modulated Fluorescence (Pmf) Spectroscopymentioning

confidence: 99%

“…The AC surface concentration manifests itself as a modulated fluorescence signal that can be measured by phase-sensitive detection. The dependency of the amplitude and phase shift of the optical signal contains information on the nature of the charge transfer and adsorption process [11,12].…”

Section: Introductionmentioning

confidence: 99%

Interfacial behavior of sulforhodamine 101 at the polarized water/1,2-dichloroethane interface studied by spectroelectrochemical techniques

et al. 2006

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“…9). 29 The PMF spectrum indicates significant differences from the emission spectra measured in the bulk of the aqueous and organic phases. The wavelength of the maximum response in the PMF spectrum was found close to that of the emission spectrum measured in DCE.…”

Section: Rtmentioning

confidence: 96%

“…Potential-modulation spectroscopy, therefore, has been applied for the charge-transfer reaction across the liquid/liquid interface in terms of the potential-modulated reflectance (PMR) 25,26 and the potential-modulated fluorescence (PMF). 27,28 In particular, the high sensitivity of PMF spectroscopy to interfacial phenomena has enabled us to use various fluorescent species, such as porphyrin, [27][28][29] xanthene, 30-32 and pyrene derivatives. 33 The fundamental expression of PMF responses is derived within the framework of simple phenomenological models for ion-transfer and adsorption at a polarized liquid/liquid interface.…”

Section: ·2 Potential-modulated Fluorescence Spectroscopy Atmentioning

confidence: 99%

“…It should be noted that the second quadrant complex plane is applied for the transfer of anionic species, since the potential dependence of the direction of the transfer process is opposite. 29,31 In the case that the adsorption of ionic species is described by the potential-dependent adsorption model based on the Langmuir isotherm, the frequency-dependent fluorescence response (ΔFa) associated with the adsorption of the fluorescent ion from the aqueous phase to the interface can be expressed as a function of the ac surface coverage (θac), 28 ΔFa = 2.303εΦI0ΓsSθac, where Γs is the saturated interfacial concentration. θac is described as…”

Section: ·2 Potential-modulated Fluorescence Spectroscopy Atmentioning

confidence: 99%

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Potential-Modulation Spectroscopy at Solid/Liquid and Liquid/Liquid Interfaces

Nagatani

Sagara

2007

ANAL. SCI.

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Transfer Mechanism of Anthracycline Antibiotics and Their Ion Association with PAMAM Dendrimer at Liquid|Liquid Interfaces**

et al. 2022

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The transfer reaction of anthracycline antibiotics, daunorubicin (DNR) and doxorubicin (DOX), was investigated at the water|1,2‐dichloroethane (DCE) interface. Spectroelectrochemical analysis demonstrated significant changes in the transfer mechanism of anthracycline cations with a slight structural difference across the bare water|DCE interface and the biomimetic interface with a phospholipid layer. The facilitated ion transfer feature was found for both HDNR+ and HDOX+ at the biomimetic interface, where the adsorption process of HDOX+ was observed over a wide potential range at the aqueous side of the interface, that is, the polar headgroup region of the phospholipid layer. The molecular association between the carboxylate‐terminated generation 3.5 polyamidoamine (G3.5 PAMAM) dendrimer and anthracycline derivatives occurred preferentially under neutral pH conditions. The negatively charged G3.5 PAMAM dendrimer induced positive shifts of the transfer potential of anthracycline cations at the water|DCE interface, indicating its ability as potential‐ and pH‐responsive drug carriers.

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Direct spectroelectrochemical observation of interfacial species at the polarized water/1,2-dichloroethane interface by ac potential modulation technique

Cited by 22 publications

References 20 publications

Interfacial behavior of sulforhodamine 101 at the polarized water/1,2-dichloroethane interface studied by spectroelectrochemical techniques

Interfacial behavior of sulforhodamine 101 at the polarized water/1,2-dichloroethane interface studied by spectroelectrochemical techniques

Potential-Modulation Spectroscopy at Solid/Liquid and Liquid/Liquid Interfaces

Transfer Mechanism of Anthracycline Antibiotics and Their Ion Association with PAMAM Dendrimer at Liquid|Liquid Interfaces**

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