Adsorption of 1,3-dithiol-2-thione-4,5-dithiolate on silver surface studied by surface-enhanced Raman spectroscopy

Joy, V.T; George, Lisa; Srinivasan, T.

doi:10.1016/s0009-2614(99)00142-6

Cited by 10 publications

(2 citation statements)

References 19 publications

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“…Similar results were obtained in our previous FT-SERS study on 1,3-dithiol-2-thione-4,5-dithiolate ion on a silver surface. 29 In the case of dmtd, an upward shift in the wavenumber of (C N) sym suggests that the adsorbed dianion probably interacts with the surface through its HOMO ( -type), which is antibonding with respect to the C N bond. Such an interaction would transfer some excess negative charge from the dianion to the surface and this would decrease the antibonding character of the C N bond and hence increase the wavenumber of (C N) sym .…”

Section: 5-dimercapto-134-thiadiazole (Dmtd)mentioning

confidence: 99%

Ft‐SERS studies on 1,3‐thiazolidine‐2‐thione, 2,5‐dimercapto‐1,3,4‐thiadiazole and 2‐thiouracil adsorbed on chemically deposited silver films

Joy

Srinivasan

2001

J Raman Spectroscopy

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Adsorption of 1,3-thiazolidine-2-thione (ttz), 2,5-dimercapto-1,3,4-thiadiazole (dmtd) and 2-thiouracil on a silver surface was studied by the FT-SERS technique. The FT-SERS spectra of all these molecules indicate dissociative adsorption on the silver surface to the corresponding thiolate ion. For ttz and 2-thiouracil, the corresponding thiolate ions are found to adsorb to the surface through their sulfur atoms and have a perpendicular orientation on the silver surface. For dmtd, the results suggest that the dithiolate ion has two kinds of adsorption geometries depending on the concentration of the dmtd in solution. At low concentration the diothiolate ion probably adsorbs through the nitrogen atom whereas at high concentration the ion probably adsorbs through its p-system

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Section: 5-dimercapto-134-thiadiazole (Dmtd)mentioning

confidence: 99%

Ft‐SERS studies on 1,3‐thiazolidine‐2‐thione, 2,5‐dimercapto‐1,3,4‐thiadiazole and 2‐thiouracil adsorbed on chemically deposited silver films

Joy

Srinivasan

2001

J Raman Spectroscopy

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“…Electromagnetic theoretical calculations have shown that the wavelength for optimal enhancement shifts to longer wavelengths with increasing particle size. Thus, a strong enhancement on chemically deposited silver films compared to that on silver colloids probably arises from the larger particle size of the former arising from larger degree of aggregation. − Since only the electromagnetic enhancement mechanism is critically dependent on the size and shape of the particles, , a strong enhancement on silver films suggests that the electromagnetic mechanism is the dominant enhancement factor contributing to the FT-SERS spectrum of H 2 QS 2 for near-infrared excitation.…”

Section: Resultsmentioning

confidence: 99%

Surface-Enhanced Raman Scattering Study of Quinoxaline-2,3-dithiol and Disodium Bis(quinoxaline-2,3-dithiolato)nickelate(II) Adsorbed on Silver Surface

and

Srinivasan

1999

J. Phys. Chem. B

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Adsorption of quinoxaline-2,3-dithiol (H2QS2) and disodium bis(quinoxaline-2,3-dithiolato)nickelate(II) (Na2[Ni(QS2)2]) on a silver surface has been studied by SERRS as well as FT-SERS techniques. The surface Raman spectra of H2QS2 are very similar to the corresponding normal Raman spectra of aqueous solutions of disodium quinoxaline-2,3-dithiolate, suggesting that H2QS2 dissociates on a silver surface to the quinoxaline-2,3-dithiolate ion. Normal-mode analysis based on the results of ab initio calculation shows that in-plane modes are selectively enhanced, indicating a perpendicular orientation for the adsorbed dithiolate ion with respect to the surface. The FT-SERS spectra of H2QS2 are found to be very weak on colloidal silver at all stages of aggregation, whereas intense spectra are observed when adsorbed on chemically deposited silver films, indicating that the surface Raman spectrum is mainly enhanced through electromagnetic mechanism for near-infrared excitation. The vibrational frequencies of Na2[Ni(QS2)2] are found to be virtually unaffected by adsorption, indicating only very weak interaction with silver surface.

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Surface-enhanced Raman scattering on colloidal nanostructures

Aroca

Alvarez-Puebla

Pieczonka

et al. 2005

Advances in Colloid and Interface Science

273

208

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Adsorption of 1,3-dithiol-2-thione-4,5-dithiolate on silver surface studied by surface-enhanced Raman spectroscopy

Cited by 10 publications

References 19 publications

Ft‐SERS studies on 1,3‐thiazolidine‐2‐thione, 2,5‐dimercapto‐1,3,4‐thiadiazole and 2‐thiouracil adsorbed on chemically deposited silver films

Ft‐SERS studies on 1,3‐thiazolidine‐2‐thione, 2,5‐dimercapto‐1,3,4‐thiadiazole and 2‐thiouracil adsorbed on chemically deposited silver films

Surface-Enhanced Raman Scattering Study of Quinoxaline-2,3-dithiol and Disodium Bis(quinoxaline-2,3-dithiolato)nickelate(II) Adsorbed on Silver Surface

Surface-enhanced Raman scattering on colloidal nanostructures

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