Surface-enhanced Raman scattering study of the adsorption of croconate violet on colloidal silver particles

Alves, Ana Paula Pereira; Sena, Lídia Ágata de; Archanjo, Bráulio S.; Oliveira, Luiz Fernando Cappa de; Dantas, Socrates de Oliveira; Sant’Ana, Antônio Carlos

doi:10.1016/j.vibspec.2012.08.002

Cited by 5 publications

(1 citation statement)

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“…To the best of our knowledge, this is the first study that explores such species both experimental and theoretically by using a combination of surface-enhanced Raman scattering (SERS) and density functional theory (DFT) calculations. SERS is a highly selective and sensitive spectroscopic technique suitable to study the molecule on an extraordinary scale, making it possible to get convenient information, such as the molecule interactions and/or orientation on the nanoparticle surfaces. , SERS studies of some oxocarbons, pseudo-oxocarbons, and squaraine derivatives have been widely carried out before; for example, Stokes et al studied the SERS properties of several squaraine dyes and showed that they are excellent SERS reporters in the red and near-infrared spectral region. − SERS of squaraines has also found important applications in studies related to cancer diagnosis and imaging, , which makes this study an important complement to understanding their chemical behavior.…”

Section: Introductionmentioning

confidence: 99%

Vibrational Spectroscopic Analysis of 1,3-Dianiline Squarate: Infrared, Normal Raman, Surface-Enhanced Raman Scattering, and Density Functional Theory Calculations

et al. 2022

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1,3-Dianiline squarate (DSQ) is an interesting squaraine frequently used as an intermediary reactant in organic synthesis aiming products 1,3-(R 1 R 2)-squarate type, as well as a building block of photoinitiators under visible light widely used in photopolymerization reactions. In this work, structural investigations of DSQ were performed using spectroscopic methods such as solid-state 13C nuclear magnetic resonance and several vibrational techniques. Therefore, a detailed vibrational spectroscopic analysis of DSQ was carried out by infrared, normal Raman, and surface-enhanced Raman scattering (SERS) combined with density functional theory calculations. SERS data suggest two preferential interactions between squaraine and the silver nanoparticle. It is proposed that squaraine is adsorbed mainly through a regular Ag–O interaction involving the carbonyl group; that connection impacts the oscillators around them and consequently their vibrational spectra. In addition, the silver atoms may perturb the DSQ planarity by interacting with the phenyl rings; they promote the molecule to adopt a non-planar tilted orientation on the metal nanoparticle surface.

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Section: Introductionmentioning

confidence: 99%

Vibrational Spectroscopic Analysis of 1,3-Dianiline Squarate: Infrared, Normal Raman, Surface-Enhanced Raman Scattering, and Density Functional Theory Calculations

et al. 2022

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Chemical behavior of croconic acid coordinated to Co(II) adsorbed on silver surface

Milán‐Garcés

Georgopoulos

Sant’Ana

et al. 2018

J Raman Spectroscopy

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The vibrational properties of croconic acid (CA), the associated anionic specie croconate (CR), and their complexes with the transition metals Co(II) were investigated through surface‐enhanced Raman scattering (SERS) spectroscopy. This is the first time the SERS spectra of CA and CR are reported. The normal Raman spectrum of CA after the addition of Co(II) was similar to the corresponding spectrum of CR in the presence of Co(II), suggesting the dissociative coordination of CA with Co(II) cation. Similar behavior occurs when CA and Co(II) coadsorb on silver nanoparticle surfaces as seen by SERS spectroscopy. In the same way, the SERS spectra of CA and CR have similar spectral patterns suggesting dissociative adsorption on the metallic nanoparticle surface. The SERS spectra of CR show changes with both concentration and pH values suggesting that according to the concentration of the oxocarbon, the structural arrangements of the adsorbates on the silver surfaces change, due to a decrease of intermolecular π–π interactions between neighboring rings.

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A proposal for the adsorption of anastrozole anticancer drug on gold nanoparticle surfaces

Teixeira

Costa

Sant’Ana

2019

J Raman Spectroscopy

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Anastrozole is a well‐known anticancer drug used in aromatase‐dependent cancer chemotherapy as a nonsteroidal aromatase inhibitor. Investigations involving the adsorption of anastrozole on gold surfaces are on demand, because gold nanoparticles (AuNPs) have been used as nanocarriers of drugs, and such a compound can be used against aromatase‐expressing neoplastic cells. In this work, surface‐enhanced Raman scattering (SERS) spectroscopy was used to investigate the interaction between anastrozole and the surfaces of AuNPs. Density functional theory (DFT) calculations were used to simulate the molecular interactions with gold atom through two possible ways, triazole or nitrile moieties. Experimental results, supported by DFT calculations to assign main vibrational modes, indicate that the nitrile groups are the most preferred anchorage moieties for the adsorption.

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Surface-enhanced Raman scattering study of the adsorption of croconate violet on colloidal silver particles

Cited by 5 publications

References 32 publications

Vibrational Spectroscopic Analysis of 1,3-Dianiline Squarate: Infrared, Normal Raman, Surface-Enhanced Raman Scattering, and Density Functional Theory Calculations

Vibrational Spectroscopic Analysis of 1,3-Dianiline Squarate: Infrared, Normal Raman, Surface-Enhanced Raman Scattering, and Density Functional Theory Calculations

Chemical behavior of croconic acid coordinated to Co(II) adsorbed on silver surface

A proposal for the adsorption of anastrozole anticancer drug on gold nanoparticle surfaces

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