Vibrational study of the metal–adsorbate interaction of phenylacetic acid and α-phenylglycine on silver surfaces

Castro, José L.; Ramírez, María Rosa López; López‐Tocón, Isabel; Otero, Juan C.

doi:10.1016/s0021-9797(03)00257-1

Cited by 59 publications

(47 citation statements)

References 40 publications

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“…At 1,064 nm, the spectrum is dominated by the ionized adsorbate form resulting from the interaction with the metal (top scheme), which is the dominant species on the surface. However, the still presence of neutral molecules on the metal is evidenced when exciting at 514 (see bands marked with dotted lines), suggesting the formation of multilayers on the surface amines in SERS has been carried out mainly in the case of aminoacids or peptides [32,33], for which a preferential interaction through the N-terminal moiety of the oligopeptides was seen, thus indicating that the amino interaction with the metal is preferred to the interaction through the carboxylate one. Aromatic amines display a lower basicity; hence, their interaction with metals through electrostatic forces is weaker.…”

Section: N-containing Adsorbatesmentioning

confidence: 99%

Importance of Metal–Adsorbate Interactions for the Surface-enhanced Raman Scattering of Molecules Adsorbed on Plasmonic Nanoparticles

et al. 2007

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The interaction between adsorbates of different nature and plasmonic nanoparticles is reviewed here on the basis of the work done in our laboratory in the past few years. The paper is structured for analyzing the interaction of adsorbates with metal nanoparticles as function of the interacting atom (O, N, or S) and the adsorbate conformation. In the study of the adsorption of molecular species on metals, it is necessary to take into account that different interaction mechanisms are possible, leading to the existence of different molecular forms (isomers or conformers). These forms can be evidenced by changing the excitation wavelength, due to a resonant selection of these wavelengths. Charge-transfer complexes and electrostatic interactions are the usual driving forces involved in the interaction of adsorbates on metal surfaces when these metallic systems are used in wet conditions. The understanding of the metal-adsorbate interaction is crucial in the surface functionalization of metal surfaces, which has a growing importance in the development of sensing systems or optoelectronic devices. In relation to this, special attention is paid in this work to the study of the adsorption of calixarene host molecules on plasmonic nanoparticles.

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Section: N-containing Adsorbatesmentioning

confidence: 99%

Importance of Metal–Adsorbate Interactions for the Surface-enhanced Raman Scattering of Molecules Adsorbed on Plasmonic Nanoparticles

et al. 2007

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“…6 Although the SERS spectra feature could be roughly described by the EM mechanism, it is admitted that the CT mechanism may also contribute to the SERS intensities of several vibrational bands of PA on Au. In fact, the different enhancement values for the same symmetry as listed in Table 2 could be better explained with a combination of the EM and CT mechanisms.…”

Section: Sers Enhancement Mechanismsmentioning

confidence: 99%

“…5 An additional contribution to the SERS phenomenon is the charge-transfer (CT) mechanism as a resonance Raman process, although it depends strongly on the nature of the metal-adsorbate system without general rules. 6 Although colloidal dispersions of gold have been studied ever since the report by Faraday, 7 their physicochemical characterization was not performed systematically until lately. Surface plasmon resonance of gold nanoparticles has recently been used to monitor analyte-surface binding interactions as biosensors.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of phenylacetylene on gold nanoparticle surfaces investigated by surface‐enhanced Raman scattering

Joo

Kim

2004

J Raman Spectroscopy

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The adsorption of phenylacetylene (PA) on gold nanoparticle surfaces was investigated by means of surface-enhanced Raman scattering (SERS). The aggregation behaviors were examined by UV-visible absorption spectroscopy and transmission electron microscopy. The phenyl ring of PA appeared to assume a perpendicular orientation with respect to the gold surface from the presence of the n(CH) band at ∼3060 cm −1 . Neither a substantial red shift nor a significant band broadening of the ring breathing modes implied that a direct ring p-orbital interaction from the phenyl ring with gold substrates should be low. The SERS spectrum of PA on Au surfaces was analyzed by determining the relative enhancement factor of each vibrational band. The multiple peaks in the n(C C) stretching region were found to vary in the presence of other ionic species.

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“…It is also believed that the phenyl ring forms a complex between its -electron system and the silver. 45 The formation of the complex is accompanied by broadening, increasing of intensity, and a slight lowering of the frequencies for the aromatic ring modes. 12 In the SERS spectra of AVP and [Acc ) Phe modes, and their relatively strong intensity in comparison to the respective Raman spectra.…”

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confidence: 99%

Raman and surface‐enhanced Raman spectroscopy investigation of vasopressin analogues containing 1‐aminocyclohexane‐1‐carboxylic acid residue

et al. 2006

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In this work, Raman spectroscopy (RS) was employed to characterize molecular structures of [Arg8]vasopressin (AVP) and its [Acc2,D-Arg8]AVP, [Acc3]AVP, and [Cpa1, Acc3]AVP analogues. The RS band assignments have been proposed. To determine the mechanism of adsorption of the above-mentioned compounds adsorbed on a colloidal silver surface, surface-enhanced Raman spectra (SERS) were measured. The SERS spectra were used to determine relative proximity of the adsorbed functional groups of [corrected] investigated peptides and their orientation on the silver surface. The AVP and [Acc3]AVP SERS spectra (Acc: 1-aminocyclohexane-1-carboxylic acid) show that the L-tyrosine (Tyr) lies far from the metal surface, whereas the [Cpa1,Acc3]AVP spectrum (Cpa: 1-mercaptocyclohexaneacetic acid) provides evidence that Tyr interacts with the silver surface. These results suggest that [corrected] the binding of the Tyr-ionized phenolic group might be responsible for the selectivity of the analogues. We show that the aromatic ring of L-phenylalanine (Phe) of AVP and [Acc2,D-Arg8]AVP interacts with the silver surface. The strength of this interaction is considerably weaker for [Acc2,D-Arg8]AVP than for AVP. This might be due either to a longer distance between the Phe ring and the silver surface, or to the almost perpendicular orientation of the Phe ring towards the surface. The carbonyl group of the L-glutamine [corrected] (Gln) or L-asparagine [corrected](Asn) of AVP, [Acc2,D-Arg8]AVP, and [Acc3]AVP is strongly bound to the silver surface. We have also found that all peptides adsorb on the silver surface via sulfur atoms of the disulfide bridge, adopting a "GGG" conformation, except [Cpa1,Acc3]AVP, which accepts a "TGG" geometry.

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Vibrational study of the metal–adsorbate interaction of phenylacetic acid and α-phenylglycine on silver surfaces

Cited by 59 publications

References 40 publications

Importance of Metal–Adsorbate Interactions for the Surface-enhanced Raman Scattering of Molecules Adsorbed on Plasmonic Nanoparticles

Importance of Metal–Adsorbate Interactions for the Surface-enhanced Raman Scattering of Molecules Adsorbed on Plasmonic Nanoparticles

Adsorption of phenylacetylene on gold nanoparticle surfaces investigated by surface‐enhanced Raman scattering

Raman and surface‐enhanced Raman spectroscopy investigation of vasopressin analogues containing 1‐aminocyclohexane‐1‐carboxylic acid residue

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