Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/75364
Type: Artigo de periódico
Title: Structure and property studies of hybrid xerogels containing bridged positively charged 1,4-diazoniabi cycle [2.2.2]octane dichloride
Author: Arenas, LT
Dias, SLP
Moro, CC
Costa, TMH
Benvenutti, EV
Lucho, AMS
Gushikem, Y
Abstract: The compound di-3-n-propyltrimethoxysilane (1,4-diazoniabicycle[2.2.2]octane) dichloride, [(MeO)(3)Si(CH2)(3)N+(CH2CH2)(3)N+(CH2)(3)Si(OME)(3)]Cl-2 was obtained and was used as a precursor reagent to obtain hybrid xerogels where the organic molecule was bonded to a silica framework by reacting the ends of both sides of the precursor reagent. That is, both -Si(OME)(3) groups react with tetraethylorthosilicate (TEOS) by hydrolysis-condensation reactions. The resulting hybrid xerogels with variable C/Si mole ratios were prepared and analyzed and their textural characteristics determined. The samples prepared presented micropores with diameter 1.5 nm, the chain length of which matched with the estimated length of the organic bridging group. The charged organic bridging groups allow the immobilization of hexacyanoferrate ions by an ion exchange process. The electron transfer process of the hexacyanoferrate anionic complex confined in the pores of the matrices was Studied by cyclovoltammetry. (c) 2005 Elsevier Inc. All rights reserved.
Subject: Dabco
silica-based polymers
sol-gel
electrochemical measurements
Country: EUA
Editor: Academic Press Inc Elsevier Science
Rights: fechado
Identifier DOI: 10.1016/j.jcis.2005.10.007
Date Issue: 2006
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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