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Type: Artigo de periódico
Title: Spectroscopic And Electrochemical Study Of [ru(nh3)5oh2]3+, [ru(nh3)5cl]2+, And [os(nh3)5oh2]3+ Immobilized On Thin Film Of Ti(iv) Oxide Dispersed On The Silica Gel Surface
Author: Do Carmo D.R.
Rodrigues-Filho U.P.
Gushikem Y.
Franco D.W.
Abstract: [Ru(NH3)5H2O]3+, [Ru(NH3)5Cl]2+ and [Os(NH3)5H2O]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)5H2O]3+ (668 nm), [Ru(NH3)5 Cl]2+ (676 nm) and [Os(NH3)5H2O]3+ (825 nm), attributed to MIII → TiIV (M = Ru(III) and Os(III)) metal to metal charge transfer process. For the mononuclear anchored species [Ru(NH3)5H2O]3+, [Ru(NH3)5Cl]2+ and [Os(NH3)5H2O]3+, the (E1/2) for the M(III)/M(II) couple at 25°C 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. © 2000 Elsevier Science B.V.
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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