Transfer and adsorption of 1-pyrene sulfonate at the water / 1,2-dichloroethane interface studied by potential modulated fluorescence spectroscopy

The transfer mechanism of 1-pyrene sulfonate anion (PSA−) across the polarized water 1,2-dichloroethane (DCE) interface was investigated by a combination of electrochemical techniques and potential modulated fluorescence (PMF) spectroscopy under total internal-reflection. The dependence of the cyclic voltammogram and the ac voltammogram on the PSA− concentration showed an apparent reversible ion transfer process. However, the PMF responses exhibited a complex dependence on the PSA− concentration, revealing adsorption and dimerization processes taking place at the interface. Analysis of the dynamic spectroelectrochemical responses suggests that PSA− is adsorbed at the interface prior to the transfer step. Upon transferring to the organic phase, PSA− appears to accumulate at the interface undergoing a dimerization reaction.


Published in:
Journal of Electroanalytical Chemistry, 518, 1-5
Year:
2002
Publisher:
Elsevier
ISSN:
0022-0728
Keywords:
Laboratories:


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 Record created 2011-05-11, last modified 2018-12-03

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