André-Barrès, Christiane and Najjar, Fadia and Maether, Marie-Pierre and Payrastre, Corinne and Lavedan, Pierre and Tzedakis, Théo
Comparison of diffusivities data of streptocyanine dyes by electrochemical and NMR-DOSY methods.
(2012)
Journal of Electroanalytical Chemistry, 686. 54-57. ISSN 1572-6657
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(Document in English)
PDF (Author's version) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader 4MB |
Official URL: http://dx.doi.org/10.1016/j.jelechem.2012.09.030
Abstract
Diffusivity data of streptocyanine dyes in acetonitrile were investigated using both transient voltammetric techniques and NMR-DOSY. Results of voltammetric measurements allow determination of the diffusion coefficient D values in the range of 1.2-1.6 x 10-9 m² s-1 for the target dyes. Deuterated acetonitrile solvent was used for NMR-DOSY experiments and diffusivities of streptocyanines are given after calibration of acetonitrile on its tracer diffusion value of D∗ACN of 4.37 x 10-⁹. The results for the two methods appear to be in good agreement allowing use of the convenient NMR-DOSY method to measure diffusivity of streptocyanine dyes at low concentrations and so giving a direct access to the number of exchanged electrons using limiting current electrochemical techniques. This last method affords a great advantage of obtaining diffusion coefficients by non-electrochemical method.
Item Type: | Article |
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Additional Information: | Thanks to Elsevier editor. The original PDF can be found at Journal of Electroanalytical Chemistry website: http://www.sciencedirect.com/science/article/pii/S157266571200389X |
HAL Id: | hal-00878483 |
Audience (journal): | International peer-reviewed journal |
Uncontrolled Keywords: | |
Institution: | French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE) Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE) Other partners > Lebanese University - LU (LEBANON) Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE) |
Laboratory name: | |
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Deposited On: | 30 Oct 2013 09:54 |
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