STUDY OF THE ELECTROCHEMICAL BEHAVIOR OF SAME CALIXARENES IN THE PRESENT OF IONS METALS / ESTUDO DO COMPORTAMENTO ELETROQUÍMICO DE ALGUNS CALIXARENOS EM PRESENÇA DE ÍONS METÁLICOS

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

The study of the electrochemical behavior of electrodes of carbon paste chemically modified with the following calixarenes: 4-sulf- calix[4]arene and 4-terc-butilcalix[4,6,8]arene was investigated in the present of cations (Sb3+, Se4+, Mn2+, Cd2+, Zn2+, Cu2+, Pb2+, V4+ and V5+) using differential pulse , square wave and cyclical voltammetry. Other electrochemical studies for each cited calixarene was investigated. Successive voltammograms in the way had been made differential pulse voltammetric and sweepings linear (cyclic) under different scan rates and observed that in the oxidation of the 4-sulf-calix[4]arene and 4-terc- butilcalix[4,8]arene passivation and accumulation in the surface of exactly. In the study of the electrochemical process observed in the presence of eight cations (Sb3+, Se4+, Mn2+, Cd2+, Zn2+, Cu2+, Pb2+, V4+ and V5+) the following electrodes of work was used: carbon paste modified with 4-terc-butilcalix [4]arene, electrode carbon and unmodified carbon paste electrode. Considerable attention was dedicated to the study of the behavior of the 4-sulfcalix[4]arene in the present of V4+ and V5+ using as work electrode the carbon and carbon paste modified with 4-terc-butil-calix[4] areno and unmodified. It was observed, in presence of this ion metallic, the appearance in the voltammogram of new peaks related to the formation of complexes. An analytical useful voltammetric current was gotten for oxidation of complex (calixarene / vanadium). The interference of some cations (Sb3+, Se4+, Mn2+, Cd2+, Zn2+, Cu2+, Pb2+) in the V4+ analysis in presence of 4-sulf-calix[4]areno was studied. Calibration curve gotten in presence of V4+ had been constructed with carbon paste modified with 4-terc-butilcalix[4]arene, unmodified carbon paste electrode and carbon electrode in the presence of 4-sulfcalix[4]areno.

ASSUNTO(S)

vanadium electrochemistry calixarenes calixarenos vanadio eletroquimica

ACESSO AO ARTIGO

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