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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Spectroscopic characterization of cadion: UVvis, resonance Raman and DFT calculations of a versatile metal complexing agent

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Lepre, Luiz F. [1] ; Inoue, Fabiana [1] ; Corio, Paola [1] ; Santos, Paulo S. [1] ; Ando, Romulo A. [1]
Total Authors: 5
[1] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, Lab Espect Mol, BR-05508000 Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Journal of Raman Spectroscopy; v. 44, n. 4, p. 567-572, APR 2013.
Web of Science Citations: 1

The spectroscopic characterization of cadion or 1-(4-nitrophenyl)-3-(4-phenylazophenyl)triazene, its anionic species and its complexes with Hg2+, Cd2+ and Ni2+ in DMSO solution is presented. Resonance Raman (RR) and UVvis spectroscopy were the techniques of choice with results supported by density functional theory calculations. As previously reported, the UVvis data indicate distinct absorption spectra for the five species mentioned, allowing for spectrophotometric metal differentiation. In order to understand the electronic spectra of such species, we performed a detailed RR investigation, where the spectral profiles revealed the vibrational modes mainly involved in the chromophoric moieties. The distinct enhancement profile observed for each species suggests that the charge transfer from the -system to the electron withdrawing NO2 group is modulated by the electron donating triazene moiety, depending on the metal attached. The results reported herein show that RR spectroscopy can be potentially used in the metal detection of multicomponent samples by the proper choice of the excitation wavelength. Copyright (c) 2012 John Wiley \& Sons, Ltd. (AU)

FAPESP's process: 11/22263-8 - CO2 absorption by ionic liquids
Grantee:Rômulo Augusto Ando
Support type: Regular Research Grants
FAPESP's process: 06/58748-7 - Reactivity, dynamics and spectroscopy of complex systems
Grantee:Marcia Laudelina Arruda Temperini
Support type: Research Projects - Thematic Grants