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Type: Artigo de periódico
Title: Spectroscopic and electrochemical study of [Ru(NH3)(5)OH2](3+) [Ru(NH3)(5)Cl](2+), and [Os(NH3)(5)OH2](3+) immobilized on thin film of Ti(IV) oxide dispersed on the silica gel surface
Author: do Carmo, DR
Rodrigues, UP
Gushikem, Y
Franco, DW
Abstract: [Ru(NH3)(5)H2O](3+), [Ru(NH3)(5)Cl](2+) and [Os(NH3)(5)H2O](3+) were supported on the hydrated titanium alkoxide grafted on silica gel surface. The mononuclear complexes on the matrix surface have been characterized by specific surface area, elemental analysis, UV-Vis spectroscopy and electrochemical techniques (cyclic voltammetry, differential pulse polarography). These supported species exhibit one defined band on the visible region of the electronic spectrum: band [Ru(NH3)(5)H2O](3+) (668 nm), [Ru(NH3)(5)Cl](2+) (676 nm) and [Os(NH3)(5)H2O](3+) (825 nm), attributed to M-III --> Ti-IV (M = Ru(III) and Os(III)) metal to metal charge transfer process. For the mononuclear anchored species [Ru(NH3)(5)H2O](3+), [Ru(NH3)(5)Cl](2+) and [Os(NH3)(5)H2O](3+), the (E-1/2) for the M(III)/IM(II) couple at 25 degreesC are, respectively: -0.22, -0.28, and -1.15 V versus SCE. A formation of an oxo bridge Ti-O-M(NH3)(5) (M = Ru, Os) and chloro bridge Ti-Cl-Ru(NH3)(5) was postulated for the grafted complexes on the SiO2/TiO2 surface. (C) 2000 Elsevier Science B.V. All rights reserved.
Subject: silica
Country: Inglaterra
Editor: Pergamon-elsevier Science Ltd
Rights: fechado
Identifier DOI: 10.1016/S0277-5387(00)00489-7
Date Issue: 2000
Appears in Collections:Unicamp - Artigos e Outros Documentos

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