A beta-Cyclodextrin/Siloxane Hybrid Polymer: Synthesis, Characterization and Inclusion Complexes

Autor(es)

Abbehausen, Camilla ^[1] ; Formiga, Andre L. B. ^[1] ; Sabadini, Edvaldo ^[1] ; Yoshida, Inez V. P. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Inst Chem, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 21, n. 10, p. 1867-1876, 2010.
• Citações Web of Science: 10

Resumo

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 (13)C and (29)Si 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). (AU)

• Processo FAPESP: 03/09926-1 - Materiais poliméricos e cerâmicos
• Beneficiário: Inez Valeria Pagotto Yoshida
• Modalidade de apoio: Auxílio à Pesquisa - Programa PRONEX - Temático