Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/22657
Tipo: Artigo
Título: In situ oligomerization of 2- (thiophen-3-yl) acetate intercalated into Zn2Al layered double hydroxide
Autor(es): Tronto, Jairo
Pinto, Frederico G.
Costa, Liovando M. da
Leroux, Fabrice
Dubois, Marc
Valim, João B.
Abstract: A layered double hydroxide (LDH) with cation composition Zn2Al was intercalated with 2-(thiophen-3-yl)acetate (3-TA) monomers. To achieve in situ polymerization and/or oligomerization of the intercalated monomers, soft thermal treatments were carried out, and subsequent hybrid LDH materials were analyzed by means of several characterization techniques using powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), 13C CP–MAS nuclear magnetic resonance (NMR), electron spin resonance (EPR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), inductively coupled plasma optical emission spectroscopy (ICP–OES), and elemental analysis. PXRD analysis suggested that the intercalated monomers formed a bilayer. Thermal treatment of the hybrid LDH assembly above 120 °C provokes partially the breakdown of the layered structure, generating the phase zincite. EPR results indicated that vicinal monomers (oligomerization) were bound to each other after hydrothermal or thermal treatment, leading to a polaron response characteristic of electron conductivity localized on a restricted number of thiophene-based monomer segments. Localized unpaired electrons exist in the material and interact with the 27Al nuclei of the LDH layers by superhyperfine coupling. These unpaired electrons also interact with the surface of ZnO (O2− vacancies), formed during the thermal treatments.
Palavras-chave: Layered double hydroxide
Conducting polymer
Thiophene derivatives
Oligomerization
Intercalation compounds
2- (Thiophen-3-yl) acetate
Editor: Journal of Solid State Chemistry
Tipo de Acesso: 2014 Elsevier Inc. All rights reserved.
URI: https://doi.org/10.1016/j.jssc.2014.10.030
http://www.locus.ufv.br/handle/123456789/22657
Data do documento: Jan-2015
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