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Please use this identifier to cite or link to this item: http://hdl.handle.net/1812/533

Title: The electrochemical behaviour of Para-Sulfonatocalix[4]arene ions in the presence of ionic liquids as supporting electrolyte
Authors: Ninie Suhana Abdul Manan
Keywords: Para-Sulfonatocalix[4]arene
Ionic liquids
sodium p-sulfonatocalix[4]arene
Water mixtures
Issue Date: 2008
Publisher: University Malaya
Abstract: The electrochemical behaviour of sodium p-sulfonatocalix[4]arene (s-psc4) was studied. In this study ionic liquid/water mixtures were used as electrolyte, namely, [BMIM][BF4]/water mixture and [BMIM][OTf]/water mixture ([BMIM] = 1-butyl 3-methyl imidazolium, BF4 = tetrafluoroborate, OTf = trifluoromethanesulfonate). Spsc4 can be oxidised at 0.84 V and 0.83 V in [BMIM][BF4]/water and [BMIM][OTf]/water respectively. The reaction is an irreversible process for both systems. The number of electron transferred in this electrochemical process is one electron and the diffusion coefficient, (D) for both systems was 1.15 x 10-8 cm2 s-1 and 1.67 x 10-8 cm2 s-1 respectively. The anodic potentials were affected by temperature and the activation energy, (Ed) was 18.18 kJ mol-1 and 18.78 kJ mol-1 in [BMIM][BF4]/water mixture and [BMIM][OTf]/water mixture respectively. Sodium ion, (Na+) on s-psc4 has been replaced with bigger ion, N1444 + (tributyl ammonium ion) in order to fully dissolve it in pure ionic liquid. The electrochemisty of the prepared calixarene namely, (N1444)SO3calix[4]arene, was done in pure ionic liquid, [BMIM][BF4]. Two oxidation peaks were observed at 0.20 V and 1.20 V and were assigned as the oxidation of phenolate and phenol ion.
Description: Dissertation -- Faculty of Science, University of Malaya, 2008.
URI: http://dspace.fsktm.um.edu.my/handle/1812/533
Appears in Collections:Masters Dissertations : Science

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