Tuning charge-transfer processes in the surface-enhanced Raman scattering of l-α-phenylglycine adsorbed on silver nanostructures

López-Ramírez, María Rosa; Garcia-Ramos, J.V.; Otero, Juan C.; Castro, José L.; Sánchez-Cortés, Santiago

doi:10.1016/j.cplett.2007.08.069

Cited by 22 publications

(19 citation statements)

References 30 publications

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“…Thanks to the SERS technique and the quantum‐mechanical data, it was possible to identify the main mechanisms of interaction between the peptides and Ag nanoparticles. The present results differ from those reported for other oligopeptides in the literature . In fact, the pept1–Ag colloid interaction is prevalently due to COO − groups, with the peptidic bond tilted and close to the silver surface.…”

Section: Discussioncontrasting

confidence: 99%

Surface enhanced Raman scattering and quantum‐mechanical calculations on self‐assembling oligopeptides

Foggia

Ottani

Torreggiani

et al. 2018

J Raman Spectroscopy

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The surface‐enhanced Raman scattering spectra of 5 amphiphilic oligopeptides derived from EAK16 (AEAEAKAK)2, used as biomimetic coatings for medical devices, were obtained at 10−5–10−6 M in order to study the effects of systematic amino acid substitution along the peptide chain on the corresponding interaction with Ag colloidal nanoparticles. In addition, quantum‐mechanical data on 2 of the examined peptides were very useful for clarifying the assignment of bands, widely debated in the literature. In general, the peptide–nanoparticles interaction takes place through the COO− groups. The substitution of Ala by 2‐aminobutanoic acid in the sequence, corresponding to an increase of the hydrophobic chain length, is able to affect the peptide–Ag colloid interaction. It strengthens the interaction with NH3+ groups, mediated by the Cl− anions present in the colloidal solution, although the charge transfer interaction with the COO− ions remains the dominant interaction mechanism. When Tyr substitutes the hydrophobic Ala, the interaction mechanism is strongly affected because it takes mainly place through the Tyr residues, where the aromatic rings are predominantly perpendicular to the silver surface, partly as tyrosinate ion. Thus, the addition of the Arg‐Gly‐Asp sequence, useful to provide control on the bioactivity of the bone regeneration materials, does not change the interactions with the colloid, because the spacer amino acid substitution is the main factor affecting the peptide–nanoparticle interactions.

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Section: Discussioncontrasting

confidence: 99%

Surface enhanced Raman scattering and quantum‐mechanical calculations on self‐assembling oligopeptides

Foggia

Ottani

Torreggiani

et al. 2018

J Raman Spectroscopy

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“…, Table ) is perpendicular to the Ag surface or the band at 1580 cm −1 is enhanced due to a charge‐transfer process. The latter has been observed for the mode 8a . A very weak band in the high‐wavenumber region (at 3088 cm −1 ) could be assigned to ν(CH) of the heterocyclic ring.…”

Section: Resultsmentioning

confidence: 58%

Substituent effect on structure and surface activity of N‐methylpyridinium salts studied by FT‐IR, FT‐RS, SERS and DFT calculations

Marzec

Jaworska

Malek

et al. 2012

J Raman Spectroscopy

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The substituent effect on structure and surface activity of mono-and disubstituted N-methylpyridinium salts was investigated by means of Raman, infrared and surface-enhanced Raman spectroscopy (SERS). The significant differences observed in Raman and infrared spectra have been correlated with marker bands assigned to in-plane and out-of-plane vibrations, respectively. This vibrational analysis, complemented by quantum chemical calculations (B3LYP/ 6-311++G(d,p)) was a basis for investigation of the surface activity of the studied compounds. Significant differences in their SERS spectra related to the enhancement mechanism and adsorbate orientation have been observed and analyzed.

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“…According to Wilson's nomenclature [36], this band is the 8a ring deformation mode. It has been previously proposed that the intensity of this band reflects the degree of charge transfer between an aromatic adsorbate with the metal substrate [37].…”

Section: Resultsmentioning

confidence: 99%

Adsorption analysis of nitrophenol isomers on silver nanostructures by surface-enhanced spectroscopy

Perry

Son

Cordova

et al. 2010

Journal of Colloid and Interface Science

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Tuning charge-transfer processes in the surface-enhanced Raman scattering of l-α-phenylglycine adsorbed on silver nanostructures

Cited by 22 publications

References 30 publications

Surface enhanced Raman scattering and quantum‐mechanical calculations on self‐assembling oligopeptides

Surface enhanced Raman scattering and quantum‐mechanical calculations on self‐assembling oligopeptides

Substituent effect on structure and surface activity of N‐methylpyridinium salts studied by FT‐IR, FT‐RS, SERS and DFT calculations

Adsorption analysis of nitrophenol isomers on silver nanostructures by surface-enhanced spectroscopy

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