A-βcyclodextrin/siloxane hybrid polymer: synthesis, characterization and inclusion complexes

Autor(es)

Camilla Abbehausen ^[1] ; André L. B. Formiga ^[2] ; Edvaldo Sabadini ^[3] ; Inez V. P. Yoshida ^[4]

Afiliação do(s) autor(es)

^[1] Institute of Chemistry - Brasil

^[2] Institute of Chemistry - Brasil

^[3] Institute of Chemistry - Brasil

^[4] Institute of Chemistry - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 21, n. 10, p. 1867-1876, 2010-00-00.

Resumo

A hybrid polymer derived from siloxane and β-cyclodextrin (β-CD) was obtained by reaction of β-CD with g-isocyanatopropyltriethoxysilane (IPTS), followed by hydrolysis/condensation reactions, generating a β-CD-modified polysilsesquioxane resin (PSS-β-CD). PSS-β-CD hybrid was characterized by infrared spectroscopy and 13C and 29Si nuclear magnetic resonance. This hybrid was typically amorphous and thermally stable up to 180 ºC. PSS-β-CD was able to form films and its morphology was evaluated by scanning electron microscopy. The capability of β-CD grafted in the hybrid polymer to form inclusion complex was evaluated by the formation of a β-CD-phenolphthalein complex using UV-Vis spectroscopy. Even without changes in pH, the red form of phenolphthalein converts to the colorless one when PSS-β-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 β-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