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|Type:||Artigo de periódico|
|Title:||Preparation of Polyaminopyridines Using a CuI/L-Proline-Catalyzed C-N Polycoupling Reaction|
|Abstract:||Polyaminopyridines (PAPy) were chemically prepared from amino-bromopyridines by a CuI/L-proline-catalyzed C-N polycondensation reaction. The formation of the polymer was confirmed by GPC, XRD, XRF, FTIR, UV-vis (lambda(max) = 400 nm), H-1 and C-13 NMR. The number-average molecular weights (M-n) were estimated by end-group analysis using X-ray fluorescence (up to 6000 Da). TGA analysis of PAPy with higher M-n showed greater thermal stability up to 170 degrees C. Viscosity measurements of polymer in formic acid at 30 degrees C indicated a polyelectrolyte nature of PAPy solutions. Furthermore, the amorphicity of the material was observed by X-ray diffraction analysis.|
Ullmann coupling reaction
end-group analysis by XRF
|Appears in Collections:||Artigos e Materiais de Revistas Científicas - Unicamp|
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