NDLI: Some Thermodynamic Properties of Aqueous 2-Mercaptopyridine-N-Oxide (Pyrithione) Solutions

Content Provider	Springer Nature Link
Author	Bretti, Clemente Cigala, Rosalia Maria Lando, Gabriele Milea, Demetrio Sammarta, Silvio
Copyright Year	2014
Abstract	The thermodynamic properties of 2-mercaptopyridine-N-oxide (pyrithione, PT) were studied potentiometrically in NaCl aqueous solutions at different ionic strengths and temperatures. A set of protonation constants is provided, together with distribution (water/2-methyl-1-propanol) and solubility data. The total and the specific solubility (solubility of neutral species) values of pyrithione were determined and, for example, are 0.0561 and 0.0518 mol·dm$^{−3}$ at c $_{NaCl}$ = 0.244 mol·dm$^{−3}$ and T = 298.15 K. By fitting the distribution and solubility results against the ionic strength, the Setschenow coefficient and the activity coefficients of the neutral species were determined. In pure water, the specific solubility is log$_{10}$ $$ S_{m 0}^{0} = \, {-} 1. 20 \, \pm \, 0.0 4 $$ . To determine the activity coefficient of the charged species and the protonation constant at infinite dilution, the data were analyzed by different models, namely the Debye–Hückel type equation, the SIT (Specific ion Interaction Theory) and the Pitzer approach. The interaction coefficient of the deprotonated pyrithione species was determined [ε(Na$^{+}$, PT$^{−}$) = −0.105 ± 0.002]. The protonation enthalpy was also determined, is slightly positive, and the protonation process is entropic in nature. At infinite dilution and T = 298.15 K, log$_{10}$ K $^{H0}$ = 4.620 ± 0.002, ΔG $^{0}$ = –26.4 ± 0.1 kJ·mol$^{−1}$, ΔH $^{0}$ = 2.1 ± 0.5 kJ·mol$^{−1}$ and TΔS $^{0}$ = 28.5 ± 0.5 kJ·mol$^{−1}$. The electrochemical behavior of pyrithione was studied in NaCl solutions at T = 298.15 K. It was found that voltammetry can be used to study the binding ability of pyrithione towards metal cations. The results of this work are in agreement with literature findings and improve the knowledge of the chemistry of pyrithione in aqueous solutions.
Starting Page	1093
Ending Page	1109
Page Count	17
File Format	PDF
ISSN	00959782
Journal	Journal of Solution Chemistry
Volume Number	43
Issue Number	6
e-ISSN	15728927
Language	English
Publisher	Springer US
Publisher Date	2014-06-25
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Pyrithione Thermodynamics Activity coefficients SIT Pitzer Physical Chemistry Industrial Chemistry/Chemical Engineering Geochemistry Oceanography Inorganic Chemistry Condensed Matter Physics
Content Type	Text
Resource Type	Article
Subject	Biochemistry Molecular Biology Biophysics Physical and Theoretical Chemistry

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