کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
216200 1426266 2012 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Association of ionic liquids with cationic dyes in aqueous solution: A thermodynamic study
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Association of ionic liquids with cationic dyes in aqueous solution: A thermodynamic study
چکیده انگلیسی

In this paper, the interactions between cationic dyes and the ionic liquids (ILs) have been studied by 31P nuclear magnetic resonance (NMR), UV–Vis spectroscopy and conductometric measurements at different temperatures. It was shown that a decrease in the measured specific conductance of the (dye + IL) mixtures was caused by the formation of non-conducting or less conducting (dye + IL) associates. The associates were formed by 1:1 ratio of cation of the cationic dyes and anion of the ILs by using the 31P NMR and UV–Vis spectroscopy methods. The association constants were calculated by theoretical model based on the deviation from linear behavior, and the association constants were as high as 106 (L · mol−1)2. Thermodynamic results imply that the formation process of association was exothermic nature. It is expected that the associates reported here would have promising application as active materials for the preparation of ion-selective electrode used in the determination of ILs concentrations.


► Precipitate was formed between cationic dye and ionic liquid in aqueous solution.
► Precipitates are 1:1 formed by cation of the dyes and anion of the ionic liquids.
► Association constants decrease with increasing temperature.
► The associates can be used as active materials of ion-selective electrode.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Journal of Chemical Thermodynamics - Volume 47, April 2012, Pages 223–227
نویسندگان
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