Artículos de revistas
A beta-Cyclodextrin/Siloxane Hybrid Polymer: Synthesis, Characterization and Inclusion Complexes
Registro en:
Journal Of The Brazilian Chemical Society. Soc Brasileira Quimica, v. 21, n. 10, n. 1867, n. 1876, 2010.
0103-5053
WOS:000282709800010
10.1590/S0103-50532010001000011
Autor
Abbehausen, C
Formiga, ALB
Sabadini, E
Yoshida, IVP
Institución
Resumen
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) A hybrid polymer derived from siloxane and beta-cyclodextrin (beta-CD) was obtained by reaction of beta-CD with gamma-isocyanatopropyltriethoxysilane (IPTS), followed by hydrolysis/condensation reactions, generating a beta-CD-modified polysilsesquioxane resin (PSS-beta-CD). PSS-beta-CD hybrid was characterized by infrared spectroscopy and C-13 and Si-29 nuclear magnetic resonance. This hybrid was typically amorphous and thermally stable up to 180 degrees C. PSS-beta-CD was able to form films and its morphology was evaluated by scanning electron microscopy. The capability of beta-CD grafted in the hybrid polymer to form inclusion complex was evaluated by the formation of a beta-CD-phenolphthalein complex using UV-Vis spectroscopy. Even without changes in pH, the red form of phenolphthalein converts to the colorless one when PSS-beta-CD is immersed in the solution. Theoretical calculations (AM1 and DFT methods) show that the complex is formed through the inclusion of the phenolate ring into beta-CD cavity, favoring the colorless form of phenolphthalein by more than 15 kcal mol(-1). 21 10 1867 1876 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Dow Corning do Brazil Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) FAPESP [03/09926-1] CNPq [Proc. 305916/2006-8]