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Química Nova

versão impressa ISSN 0100-4042

Resumo

BARRETO, Wagner José; BARRETO, Sônia Regina Giancoli; MOREIRA, Ivanira  e  KAWANO, Yoshio. Iron oxide and pyrocatechol: a spectroscopy study of the reaction products. Quím. Nova [online]. 2006, vol.29, n.6, pp. 1255-1258. ISSN 0100-4042.  http://dx.doi.org/10.1590/S0100-40422006000600021.

The reaction of 1,2-dihydroxy-benzene (pyrocatechol) (C6H6O2) with iron oxide (Fe2O3) and sodium thiosulfate (Na2S2O3) in aqueous medium (pH 7) was investigated. Pyrocatechol suffers autoxidation and coordinates with Fe3+ in solution. The presence of S2O32- in solution was fundamental to generate and stabilize the pyrocatechol oxidation products as o-semiquinones. This compound was isolated and its structure characterized using FT-IR, EPR and UV-Vis Spectroscopy as [CTA][Fe(SQ)2(Cat)]. A thermal mass loss mechanism was proposed based on Thermogravimetric Analysis (TG) to support the structural characterization.

Palavras-chave : pyrocatechol; iron oxide; sodium thiosulfate.

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