Safranin-O dye in the ground state. A study by density functional theory, Raman, SERS and infrared spectroscopy

Lofrumento, Cristiana; Arci, F.; Carlesi, Serena; Ricci, Marilena; Castellucci, E.; Becucci, Maurizio

doi:10.1016/j.saa.2014.07.051

Cited by 23 publications

(33 citation statements)

References 21 publications

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“…According to the geometry of the anion-metal system proposed in Ref. [6] the molecular group should lay perpendicularly to the metal surface (see also [13]) with the oxygen atoms in position 1 and 9 bounded to the silver atoms of the metal surface. As the amplification of the electric fields due to the metal plasmons occurs mainly perpendicularly to the surface of the nanoparticle (assumed to be the x axis) the modes with derived polarizability components of the type α ρσ (ρ = x and σ = x, y, z) should show enhancement in the SERS spectra with a preferential amplification due to derived polarizability tensor element α xx .…”

Section: The Sers Spectramentioning

confidence: 99%

The SERS spectra of alizarin and its ionized species: The contribution of the molecular resonance to the spectral enhancement

Lofrumento

Platania

Ricci

et al. 2015

Journal of Molecular Structure

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Section: The Sers Spectramentioning

confidence: 99%

The SERS spectra of alizarin and its ionized species: The contribution of the molecular resonance to the spectral enhancement

Lofrumento

Platania

Ricci

et al. 2015

Journal of Molecular Structure

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“…In sample IMB2, comparison with data reported in literature allows to identify the presence of safranin. This dye, whose molecular structure is shown in Fig.…”

Section: Resultsmentioning

confidence: 93%

“…Nevertheless its assignment is not unequivocal, because the Ag―O, Ag―N and Ag―Cl, when the chloride is present in the Ag colloid, stretching modes are generally observed in this low wavenumber spectral region . The contemporary presence of the above mentioned stretching modes should justify the observed broadness …”

Section: Resultsmentioning

confidence: 99%

“…d and S3). Two strong features at 1556 and 1638 cm −1 are attributed respectively to the CC stretching–HCC bending and to the HNH bending–CC stretching phenazine aromatic modes of the phenazine moiety, while the bands at 616 cm −1 and 1376 cm −1 are because of CCC bending and CC stretching phenazine aromatic modes, which are associated with the presence of phenazine‐like segments …”

Section: Resultsmentioning

confidence: 99%

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Identification of dyes in toned and tinted XX century cinematographic films by surface enhanced Raman spectroscopy

Lofrumento

Prati

Ricci

et al. 2015

J. Raman Spectrosc.

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In this paper some colored frames coming from the very popular cinematographic film Sardinian Drummer Boy, dating back to the beginning of the XX century, were analyzed. The presence in the emulsion of silver nanoparticles (AgNPs), which are formed thanks to the impression–development mechanism, confers to the cinematographic film the characteristic of being an efficient Surface Enhancement Raman Spectroscopy (SERS) substrate. This peculiarity makes it possible to investigate, in a non‐invasive way, the nature of the film components, such as the dyes used for the coloring process. In particular, Raman analyses allowed the unambiguous identification of the dyes used in tinted frames, i.e. tartrazine and safranin, in which the colorant is absorbed by the gelatin, and in toned frames, i.e. Rhodamine B, where the dye is fixed thanks to the formation of an insoluble species with AgI obtained by conversion of metallic silver. This second case is of particular interest to evaluate the possibility to identify the dye even when it is present as a silver iodide derivative. For this purpose an AgI‐colorant derivative has been prepared and its SERS spectrum compared with that obtained on the film sheet. Copyright © 2015 John Wiley & Sons, Ltd.

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“…In the early times of cinematography, it was used for toning of black and white films. SA vibrational properties have been extensively studied . A sketch of the different molecular structures is shown in Figure .…”

Section: Introductionmentioning

confidence: 99%

On the SERS quantitative determination of organic dyes

Ricci

Trombetta

Castellucci

et al. 2018

J Raman Spectroscopy

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The use of surface‐enhanced Raman scattering methods for the quantitative determination of different molecular species is not trivial as many parameters seriously affect the outcome of any experiment. In this work, we use as a case study the quantitative analysis of ionic organics dyes. We report on the role of different molecular properties to the modulation of the surface‐enhanced Raman scattering signal, the useful dynamic range for the determination, the dynamics of the molecule‐nanoparticle interaction process, and the time dependency of the signal. The consequences on the quantitative determination on dye mixtures, often found in the analysis of artworks, are discussed.

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Safranin-O dye in the ground state. A study by density functional theory, Raman, SERS and infrared spectroscopy

Cited by 23 publications

References 21 publications

The SERS spectra of alizarin and its ionized species: The contribution of the molecular resonance to the spectral enhancement

The SERS spectra of alizarin and its ionized species: The contribution of the molecular resonance to the spectral enhancement

Identification of dyes in toned and tinted XX century cinematographic films by surface enhanced Raman spectroscopy

On the SERS quantitative determination of organic dyes

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