| Multiwavelength spectrophotometric determination of acidity constants of 1-（2-thiazolylazo）-2-naphthol in methanol-water mixtures |
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| 作者姓名： | Ali Niazi Ateesa Yazdanipour Majid Ramezani |
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| 作者单位： | Department of Chemistry Faculty of Sciences，Azad University of Arak，Arak，Iran，Department of Chemistry，Faculty of Sciences，Azad University of Arak，Arak，Iran，Department of Chemistry，Faculty of Sciences，Azad University of Arak，Arak，Iran |
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| 摘 要： | The acid-base properties of 1-(2-thiazolylazo)-2-naphthol (TAN) in mixtures of methanol-water at 25℃and an ionic strength of 0.1 mol/L are studied by a multi-wavelength spectrophotometric method.The acidity constants of all related equilibria are estimated using the whole spectral fitting of the collected data to an established factor analysis model DATAN program was used for determination of acidity constants.The corresponding pK_a values in methanol-water mixtures were determined.There is a linear relationship between acidity constants and the mole fraction of methanol in the solvent mixtures.
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| 关 键 词： | 酸度 甲醇 分光光度法 萘酚 |
| 收稿时间： | 12 March 2007 |
| 修稿时间： | 2007-03-12 |
Multiwavelength spectrophotometric determination of acidity constants of 1-(2-thiazolylazo)-2-naphthol in methanol-water mixtures |
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| Ali Niazi Ateesa Yazdanipour Majid Ramezani.Multiwavelength spectrophotometric determination of acidity constants of 1-(2-thiazolylazo)-2-naphthol in methanol-water mixtures[J].Chinese Chemical Letters,2007,18(8):989-992. |
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| Authors: | Ali Niazi Ateesa Yazdanipour Majid Ramezani |
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| Institution: | Department of Chemistry, Faculty of Sciences, Azad University of Arak, Arak, Iran |
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| Abstract: | The acid–base properties of 1-(2-thiazolylazo)-2-naphthol (TAN) in mixtures of methanol–water at 25 °C and an ionic strength of 0.1 mol/L are studied by a multi-wavelength spectrophotometric method. The acidity constants of all related equilibria are estimated using the whole spectral fitting of the collected data to an established factor analysis model. DATAN program was used for determination of acidity constants. The corresponding pKa values in methanol–water mixtures were determined. There is a linear relationship between acidity constants and the mole fraction of methanol in the solvent mixtures. |
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| Keywords: | TAN Acidity constants Methanol Spectrophotometry DATAN |
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