Potential dependent SERS profile of sulfanilic acid on silver electrode

et al. 2011

Self Cite

The Fourier transform infrared (FT-IR) and FT-Raman spectra of sulfur trioxide-pyridine complex were recorded and analyzed. The potential-dependent surface-enhanced Raman scattering (SERS) was recorded from an electrochemically roughened silver electrode. The vibrational wave numbers of the compound were computed using the Hartree-Fock/6-31G * basis and compared with the experimental values. The presence of strong pyridine ring vibrations in the SERS spectrum reveals the interaction between the pyridine ring and the silver surface. The molecule is adsorbed on the silver surface with the pyridine ring in a tilted orientation. The direction of charge-transfer contribution to the SERS is discussed from the frontier orbital theory. The value of the calculated first hyperpolarizability is comparable to those reported for similar structures, which makes this molecule an attractive object for future studies of nonlinear optics. The optimized geometrical parameters of the title compound are in agreement with similar reported structures.

Section: Ir and Raman Spectramentioning

confidence: 99%

Section: Surface-enhanced Raman Scattering (Sers)mentioning

confidence: 99%

Section: Surface-enhanced Raman Scattering (Sers)mentioning

confidence: 99%

See 1 more Smart Citation

Spectroscopic investigations and computational study of sulfur trioxide–pyridine complex

Anto

et al. 2011

Self Cite

“…The study of sulfanilic acid is important because of its biological significance and selectivity towards the oxidants. [9] Varghese et al [10] and Panicker et al [11] reported the potential-dependent SERS profile of sulfanilamide and sulfanilic acid, respectively, on silver electrodes. So far, there is no report on the vibrational spectral analysis of the title compound.…”

Section: Introductionmentioning

confidence: 99%

Concentration and pH dependent SERS spectra of sulfanilic acid sodium salt on colloidal silver particles

Panicker¹,

Ushakumari³

et al. 2009

Self Cite

IR, Raman and surface-enhanced Raman scattering (SERS) spectra of sulfanilic acid sodium salt (SANA) were recorded and analysed. The vibrational wavenumbers were computed by the density functional theory method using the B3LYP/6-31G * basis and found to be in good agreement with the experimental values. The effect of concentration and pH dependence on the SERS intensity of the molecule was also studied. The molecular plane assumes a tilted orientation with respect to the silver surface. The observed changes of the relative intensities of some enhanced bands and the presence of in-plane and out-of-plane modes of the phenyl ring suggest that the molecule assumes a more tilted orientation upon lowering the concentration of the adsorbate.

“…The authors also observed S-O at ¾1040 cm 1 (Raman) and 1024 cm 1 (SERS) for orthanilic acid 34 and sulfanilic acid. 43 For 5-sulphosalicylic acid, S-O observed as a very strong band at 1041 cm 1 in IR spectrum and 1026 cm 1 in Raman spectrum appears at 1033 cm 1 in the SERS spectrum. This indicates the nearness of the SO bond to the silver surface.…”

Section: Sers Spectrummentioning

confidence: 99%

IR, Raman and SERS spectra of 5‐sulphosalicylic acid dihydrate

Panicker²,

Philip³

2006

Self Cite

IR, Raman and surface-enhanced Raman scattering (SERS) spectra of 5-sulphosalicylic acid were recorded and analysed. The vibrational wavenumbers were computed by density functional theoretical (DFT) method using B3LYP/6-31G * basis. The bands due to the stretching modes C O, C-S and SO 2 are intense in the SERS spectrum. The C-H stretching mode also appears in the SERS spectrum. The molecule is found to adsorb through both the carboxyl and sulphonyl groups. A possible tilted orientation of the molecule is suggested.