Vol 61 No 3 (2016): Journal of the Chilean Chemical Society
Original Research Papers


Vesna Dimova
Faculty of Technology and Metallurgy, University Ss. Cyril and Methodius
Igor Jordanov
Faculty of Technology and Metallurgy, University Ss. Cyril and Methodius
Lazo Dimitrov
Institute of Agriculture, University Ss. Cyril and Methodius
Published September 10, 2016
  • Dissociation constants,
  • CVA method,
  • 1,
  • 2,
  • 4-triazoline-3-thiones,
  • UV
  • ...More
How to Cite
Dimova, V., Jordanov, I., & Dimitrov, L. (2016). UV SPECTROPHOTOMETRIC DETERMINATION OF pK’s OF 1,2,4-TRIAZOLINE-3-THIONES IN SODIUM HYDROXIDE SOLUTIONS. Journal of the Chilean Chemical Society, 61(3). Retrieved from


Using UV spectroscopy the dissociation constants of previously synthesized 4,5-disupstituted-1,2,4-triazoline-3-thiones are determinate. The UV spectra were recorded in aqueous sodium hydroxide solutions at different pH values in the range from 190 to 360 nm, immediately after preparation of the suspension. The pKTH values were obtained experimentally, graphically and by the Characteristic Vector Analysis method. Results show that the investigated compounds have two dissociation processes. The first process belongs to the dissociation of SH proton, while the second dissociation process is dissociation of OH proton. 


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