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Comparison of diffusivities data of streptocyanine dyes by electrochemical and NMR-DOSY methods

André-Barrès, Christiane and Najjar, Fadia and Maether, Marie-Pierre and Payrastre, Corinne and Lavedan, Pierre and Tzedakis, Théodore Comparison of diffusivities data of streptocyanine dyes by electrochemical and NMR-DOSY methods. (2012) Journal of Electroanalytical Chemistry, vol. 686. pp. 54-57. ISSN 1572-6657

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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
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 - INPT (FRANCE)
Other partners > Lebanese University - LU (LEBANON)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Laboratory name:
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Deposited By: Vincent GERBAUD
Deposited On:30 Oct 2013 09:54

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