Kinetic solvent effects on alkaline decolorization of crystal violet in some aquo-organic solvents
| العنوان: | Kinetic solvent effects on alkaline decolorization of crystal violet in some aquo-organic solvents |
|---|---|
| المؤلفون: | Urmila Mandal, Sumita Sen, Kiron K. Kundu, Kaushik Deb Das |
| المصدر: | Canadian Journal of Chemistry. 64:300-307 |
| بيانات النشر: | Canadian Science Publishing, 1986. |
| سنة النشر: | 1986 |
| مصطلحات موضوعية: | chemistry.chemical_compound, Aqueous solution, Reaction rate constant, chemistry, Organic Chemistry, Inorganic chemistry, Organic chemistry, General Chemistry, Crystal violet, Solvent effects, Kinetic energy, Catalysis |
| الوصف: | Rate constants (ks) of alkaline fading of crystal violet (CV+) have been determined at 25 °C by spectrophotometric measurements in aqueous mixtures of some protic, aprotic, and dipolar aprotic cosolvents. Transfer free energies of the substrate (CV+), [Formula: see text], were also determined in some of the solvent systems from solubility measurements of the chloride salt, and by subtracting [Formula: see text] obtained earlier by use of the tetraphenylarsonium tetraphenylboron (TATB) extrathermodynamic assumption. This helped determine transfer free energies of the transition state (X≠), [Formula: see text] values of lyate ion (S−) based on the TATB assumption are already known for all of these solvent systems. The observed log (ks/kw) – composition profiles reveal that the relative solvation of the reacting species rather than the dielectric constant of the solvents dictates the complex variation of the rates of the reaction in these solvent systems. Correlation of [Formula: see text] with [Formula: see text] indicates that the reaction is largely controlled by the relative solvation of S− in most of the cases. But analysis of [Formula: see text] – composition profiles for some of the solvent systems reveals that the non-compensation of the [Formula: see text] contributions of initial-state substrate and of the transition-state complex, which may be considered to be an outer-sphere complex [CV+](S−), is also in accord with what is expected from the relative solvating characteristics of the cosolvents as guided by their respective physico-chemical properties. |
| تدمد: | 1480-3291 0008-4042 |
| DOI: | 10.1139/v86-050 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::c6ff88cbcebfaba5d447b189cee05fe5 https://doi.org/10.1139/v86-050 |
| Rights: | CLOSED |
| رقم الانضمام: | edsair.doi...........c6ff88cbcebfaba5d447b189cee05fe5 |
| قاعدة البيانات: | OpenAIRE |
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