کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1234906 | 968839 | 2008 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Multiwavelength spectrophotometric determination of acidity constants of some azo dyes
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
A multiwavelength spectrophotometric titration method was applied to study the acidity constants of some azo dyes in water. The UV–vis absorption spectra of azo dye solutions were recorded in the course of their pH-metric titration with a standard base solution. The protolytic equilibrium constants, spectral profiles, concentration diagrams and also the number of components have been calculated. The quantitative effects of the substituents on the acidity of the studied azo dyes were investigated by the linear free energy relationship (LFER) using Hammet sigma constant (σ) and field and resonance effects of Kamlet and Taft (f and ℜ, respectively).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 70, Issue 1, June 2008, Pages 1–6
Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 70, Issue 1, June 2008, Pages 1–6
نویسندگان
Mojtaba Shamsipur, Bozorgmehr Maddah, Bahram Hemmateenejad, Shohreh Rouhani, Kamaladin Haghbeen, Kamal Alizadeh,