SERS investigation on the adsorption and photoreaction of 4‐nitroanisole in Ag hydrosols

Abstract

The adsorption of 4‐nitroanisole on silver colloidal nanoparticles was investigated by surface‐enhanced Raman spectroscopy (SERS). Actually, the chemical binding with a metal substrate may play a role in changing the electronic structure of this molecule, which can be considered a push–pull chromophore, because an internal charge‐transfer occurs between methoxy and nitrogroup. A SERS signal could be detected only in chloride‐activated silver colloids, but the spectrum recorded with green‐light excitation was not related to adsorbed 4‐nitroanisole, but to its azoderivative, formed by photoreduction of the nitrogroup on the surface of the silver substrate. Copyright © 2013 John Wiley & Sons, Ltd.

Recent advances in linear and nonlinear Raman spectroscopy. Part VIII

“…It was concluded that the chemical binding with a metal substrate may play a role in changing the electronic structure of this molecule, which can be considered a push-pull chromophore, because of an internal charge-transfer that occurs between its methoxy and nitro groups. [51] Muntean and coworkers reported the SERS spectra of seven genomic DNAs from leaves of chrysanthemum. They conclude that the results of this study will generate information that is valuable for the development of label-free DNA detection for chemical probing in living cells.…”

“…Muniz‐Miranda investigated the adsorption of 4‐nitroanisole on silver colloidal NPs SERS. It was concluded that the chemical binding with a metal substrate may play a role in changing the electronic structure of this molecule, which can be considered a push‐pull chromophore, because of an internal charge‐transfer that occurs between its methoxy and nitro groups . Muntean and coworkers reported the SERS spectra of seven genomic DNAs from leaves of chrysanthemum.…”

From GISR 2012: present status and future perspectives of Raman researches in Italy

“…As reported in a contribution to the conference on the SERS investigation of 4‐anisole, a typical push–pull molecule with an electron‐drawing and electron‐donor group, the surface effect may appear even more complicated. When illuminated by the laser green line and in the presence of chloride ion, in fact, the surface promotes the photoreduction of the nitro‐group to azoderivative as proved by the appearance of –N = N– stretching frequency in the surface enhanced Raman spectrum . The peculiarity of SERS as a chemical analytical methodology has motivated its application to the detection and characterization of molecules present at bioactive concentrations such as drugs.…”

“…When illuminated by the laser green line and in the presence of chloride ion, in fact, the surface promotes the photoreduction of the nitro-group to azoderivative as proved by the appearance of -N = N-stretching frequency in the surface enhanced Raman spectrum. [6] The peculiarity of SERS as a chemical analytical methodology has motivated its application to the detection and characterization of molecules present at bioactive concentrations such as drugs. The discovery of sport doping drugs in urine is a topical analytical subject nowadays.…”

Surface enhanced Raman scattering of new acridine based fluorophore adsorbed on silver electrode

“…Currently the SERS method is used for both the study of surface itself [1][2][3][4] and the investigation of the adsorbed molecules [5][6][7][8][9]. In terms of adsorption chemistry SERS is particularly valuable because there are no alternative locally sensitive methods for the investigation the state of the adsorbate.…”