Surface chemistry of thiosemicarbazide on silver and copper electrodes

Loo, B. H.; Leahey, J.; Lee, Y.G

doi:10.1016/0039-6028(90)90159-6

Cited by 7 publications

(5 citation statements)

References 21 publications

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“…1. The SERS spectra for potentials more negative than 0.6 V are very similar to those obtained by Loo et al; 12 nevertheless, they proposed a trans configuration for TSC adsorbed on a silver electrode from 0.2 to 2.0 V, based on the small shift in the (CS) frequency values with the potential, which coincides with those of metal complexes having TSC in a trans conformation.…”

Section: Resultssupporting

confidence: 69%

“…Actually, no new bands appeared during the entire potential scanning. Figure 4 presents an amplification of the bands in the 500-850 cm 1 region of the H C TSC SERS at 0.1 and 0.8 V, together with the TU SERS spectrum at 0.8 V. No bands were observed in the H C TSC spectrum at 0.8 V that were not present in the spectrum at 0.1 V. Comparing the TU spectrum with the H C TSC spectra, coincidence between the bands of the compounds is noted, indicating that bands assigned to adsorbed TU as faradaic product by Loo et al 12 could also be attributed to the H C TSC compound. In order to confirm the SERS results, in situ UV-visible and capillary electrophoresis techniques were used.…”

Section: Resultsmentioning

confidence: 92%

“…Figure 6(B) presents the electropherogram of a TSC solution prepared in 1 mol dm 3 HCl subjected to electrolysis at 0.7 V for 40 min. According to what has been proposed by Loo et al, 12 under those conditions, the reduction of TSC should have occurred, resulting in the formation of TU and ammonium ion. As can be seen in the electropherogram in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…7 -11 In order to understand its biological activity, the knowledge of the reduction process of this kind of molecule is a very important issue. 7 By using the surface-enhanced Raman scattering (SERS) technique, Loo et al 12 studied the adsorption process of TSC on silver electrodes in neutral and acidic media for potentials more negative than 0.6 V (vs Ag/AgCl). They have identified thiourea (TU) adsorbed on the electrode surface as one of the faradaic reduction products of TSC in acidic media.…”

Section: Introductionmentioning

confidence: 99%

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Re‐examination of the adsorption and reduction processes of thiosemicarbazide at a silver electrode: SERS, UV–visible and capillary electrophoresis studies

Andrade

Micke

Tavares

et al. 2004

J Raman Spectroscopy

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The faradaic reduction process of thiosemicarbazide (TSC) on a silver electrode in acidic solution was investigated using surface-enhanced Raman scattering (SERS), UV-visible and capillary electrophoresis. No faradaic reduction product was detected, in disagreement with a previous SERS report. The TSC adsorption process on a silver electrode with different electrolyte anions in neutral solution was also studied by SERS and the change in the relative intensities of the TSC bands with the applied potential is explained based on variations in the TSC adsorbed conformations.

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Section: Resultssupporting

confidence: 69%

Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Re‐examination of the adsorption and reduction processes of thiosemicarbazide at a silver electrode: SERS, UV–visible and capillary electrophoresis studies

Andrade

Micke

Tavares

et al. 2004

J Raman Spectroscopy

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“…[38] The 1200-1000 cm À1 region contains closely spaced bands of strong intensity due primarily to the coupled oxygen atom stretching motions involving both the ring and the OH group. [32, 33a] The band at~1120 cm…”

mentioning

confidence: 99%

SERS of β‐Thioglucose Adsorbed on Nanostructured Silver Electrodes

et al. 2010

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Highly ordered microporous films of silver-containing regular arrays of spherical pores of differing diameters were prepared by electrochemical deposition into the interstitial spaces of a template formed by nanosphere lithography. These nanostructured electrodes in conjunction with a Raman microprobe spectrometer were used to obtain surface-enhanced Raman spectra (SERS) of beta-thioglucose (beta-TG) under potential control. The SERS results were compared with SERS of beta-TG on an electrochemically roughened silver electrode surface. The bands in the experimental spectra were assigned to particular vibrations with the help of ab initio predictions of the spectra. The results of this study show that beta-TG self-assembled at a silver electrode forms a hydrophilic film that may be used in biomimetic research to enhance interactions between the electrode and the hydrophilic portion of a model membrane, and to prevent interactions of proteins inserted into this membrane with the metal surface. However, in contact with the aqueous electrolyte an anomerization reaction takes place and the beta-TG film is a mixture of the alpha- and beta-anomers of thioglucose. A partial oxidation of the self-assembled molecules was also observed. In addition, the orientation of the adsorbed molecules changes as a function of the applied potential.

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