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Mesoporous TiO2 carboxymethyl-gamma-cyclodextrate multi-layer host films: effects on adsorption and electrochemistry of 1,1 '-ferrocenedimethanol

journal contribution
posted on 14.01.2013 by Susan J. Stott, Roger J. Mortimer, Katy J. McKenzie, Frank Marken
TiO2 (anatase) nanoparticles are readily deposited layer-by-layer in the form of thin films with a carboxymethyl-γ-cyclodextrate binder. Electron microscopy, voltammetric, and quartz crystal microbalance data demonstrate that the film grows homogeneously and is electrically connected to the ITO electrode surface. 1,1'-Ferrocenedimethanol is employed as an adsorbing redox system to study the voltammetric characteristics of the mesoporous host film. The binding constants for the homogeneous complexation of 1,1'-ferrocenedimethanol with carboxymethyl-γ-cyclodextrin at pH 7, Kred = 1300 ± 200 M–1, and at pH 2, Kred = 1000 ± 200 M–1, are determined assuming 1 : 1 complex formation. In the presence of the TiO2 carboxymethyl-γ-cyclodextrate films, solution phase voltammetric responses are affected due to a lower rate of diffusion of 1,1'-ferrocenedimethanol across the film (possibly due to binding to receptor sites) and due to slow electron transfer at pH 7 but not at pH 2. The TiO2 carboxymethyl-γ-cyclodextrate modified electrode, when dipped into 1,1'-ferrocenedimethanol containing solution, rinsed, and transferred into clean buffer solution, shows characteristic signals for adsorbed 1,1'-ferrocenedimethanol, consistent with weak binding and fast release upon oxidation. There is evidence for two distinct binding sites for 1,1'-ferrocenedimethanol both at pH 7 and at pH 2.

History

School

  • Science

Department

  • Chemistry

Citation

STOTT, S.J. ... et al., 2005. Mesoporous TiO2 carboxymethyl-gamma-cyclodextrate multi-layer host films: effects on adsorption and electrochemistry of 1,1 '-ferrocenedimethanol. Analyst, 130 (3), pp. 358 - 363.

Publisher

© Royal Society of Chemistry

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VoR (Version of Record)

Publication date

2005

Notes

Closed Access. This article was published in the journal, Analyst [© Royal Society of Chemistry] and the definitive version is available at: http://dx.doi.org/10.1039/B412698J

ISSN

0003-2654

Language

en

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