Citation: Ali Benvidi, Fatemeh Heidari, M. Mazloum Ardakani, Ali Mohammad Hajishabani, Jahanbakhsh Ghasemi. Spectrophotometric determination of acidity constants of 4-(2'-thiazolylazo)-resorcinol (TAR) in water-organic mixtures[J]. Chinese Chemical Letters, ;2010, 21(6): 725-729. doi: 10.1016/j.cclet.2010.01.015 shu

Spectrophotometric determination of acidity constants of 4-(2'-thiazolylazo)-resorcinol (TAR) in water-organic mixtures

a Department of Chemistry, Yazd University, Yazd, Iran;
b Department of Chemistry, Khajeh Nasir Toosi University of Technology, Iran

Received Date: 15 September 2009

The acidity constants of TAR in different water-organic solvent binary mixtures at 25℃ have been determined spectro-photometrically. DATa Analysis (DATAN) program was used for calculations of the acidity constants and pure spectra of all formed species and their concentration distribution diagram in applied pH interval. Results show that there are a fairly inverse relationship between acidity constants and the mole fraction of the organic solvent in the binary mixtures. Effects of solvent composition on the pK_as and pure spectrum of each component are also discussed.
- TAR,
- DATAN,
- Principal component analysis,
- Acidity constants,
- Binary solvents
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