Journal of the Brazilian Chemical Society | |
Interaction of poly(4-vinylpyridine) with copper surfaces: electrochemical, thermal and spectroscopic studies | |
Cristiano Giacomelli1  Fernando Carlos Giacomelli1  Adriana Lídia Santana2  Vanessa Schmidt2  Alfredo Tiburcio Nunes Pires2  José Roberto Bertolino2  Almir Spinelli1  | |
[1] ,Universidade Federal de Santa Catarina Departamento de Química Laboratório de Materiais PoliméricosFlorianópolis SC ,Brazil | |
关键词: poly(4-vinylpyridine); polymeric films; copper; | |
DOI : 10.1590/S0103-50532004000600006 | |
来源: SciELO | |
【 摘 要 】
The interaction of poly(4-vinylpyridine) (P4VP) and thiocyanate ions with copper in acid solutions was studied by cyclic voltammetry, thermogravimetry, elemental analysis and infrared spectroscopy. It is shown that at ca. -0.45 V/SCE the electrogenerated Cu(I) ions at the surface of a copper electrode induce a complexing reaction with P4VP and SCN- both present in solution. The resulting electroactive polymer-complex grows onto the electrode surface as a film, and the metallic center is further oxidized to Cu(II) in a subsequent step at ca. -0.23 V/SCE. According to thermogravimetric results, the polymer-complex is less thermally-stable than P4VP as evidenced by the lowering in the initial temperature of degradation from ca. 400 ºC (P4VP) to ca. 200 ºC (complex). The elemental analysis revealed a chemical composition of 2:1:2 for P4VP:Cu:SCN, and the infrared spectra indicated that the complex comprises a copper metallic center coordinated with nitrogen pyridinic rings (P4VP) and thiocyanate ions.
【 授权许可】
CC BY
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