引用本文:
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.
doi:
10.1016/j.cclet.2007.06.010
Citation: 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. doi: 10.1016/j.cclet.2007.06.010
Citation: 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. doi: 10.1016/j.cclet.2007.06.010
Multiwavelength spectrophotometric determination of acidity constants of 1-(2-thiazolylazo)-2-naphthol in methanol-water mixtures
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 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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关键词:
- TAN
- / Acidity constants
- / Methanol
- / Spectrophotometry
- / DATAN
English
Multiwavelength spectrophotometric determination of acidity constants of 1-(2-thiazolylazo)-2-naphthol in methanol-water mixtures
Abstract:
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 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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Key words:
- TAN
- / Acidity constants
- / Methanol
- / Spectrophotometry
- / DATAN
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