Resumo

PEREZ, M. de los A. Arada; DUHARTE, L. León  e  YAZDANI-PEDRAM, M.. Study and Characterization of a Silver-Selective Membrane Electrode Based on  5-(4-Dimethylaminobenzylidene)rhodanine. Port. Electrochim. Acta [online]. 2019, vol.37, n.6, pp.373-382. ISSN 0872-1904.  https://doi.org/10.4152/pea.201906373.

This paper has carried out the construction and evaluation of a selective electrode for silver, using 5-(4-dimethylaminobenzylidene)rhodanine as ionophore, and diocthyl phthalate (DOP) with plasticizer in PVC. The electrode shows fast potentiometric responses in the concentration range from 10^-6 to 10^-2 mol/dm³, with Nernstian slope (58.2 ± 0.8 mV/decade), and a response time of 20 s. Also, we presented a theoretical study of the molecule, optimized by DFT to a B3LYP/6-31G (d, p) level of theory. A good agreement was obtained between calculated geometrical parameters using DFT methods and experimental data. Analysis of the ionophore by the natural bond orbital (NBO) allowed explaining the possible centers of coordination with Ag⁺. Other characteristics of the electrodes were also studied.

Palavras-chave : silver-selective membranes; all-solid state ISEs; 5-(4-dimethylamino-benzylidene)rhodanine and chemical sensor.

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