Abstract
The protonation constants of ethylenedithiodiacetic, dithiodipropionic and dithiodibutyric acids were obtained from potentiometric measurements in NaCl(aq) (I ≤ 5 mol̇L-1) and (CH3)4NCl(aq) (I ≤ 3 mol̇L-1) at t=25∈°C. Their dependences on ionic strength were modeled by the SIT and Pitzer approaches. The activity coefficients of the neutral species were obtained by solubility measurements. The literature values of the protonation constants of (HOOC)-(CH2) n -S-(CH2) n -(COOH) (n=1 to 3) and (HOOC)-(CH2)-S-(CH2) n -S-(CH 2)-(COOH) (n=0 to 5) in NaCl(aq) and KCl(aq) (I ≤ 3 mol̇L -1) at 18∈°C were also analyzed using the above approaches. Both the log∈10 K i H and interaction parameter values follow simple linear trends as a function of certain structural characteristics of the ligands. Examples of modeling these trends are reported.
Original language | English (US) |
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Pages (from-to) | 763-784 |
Number of pages | 22 |
Journal | Journal of Solution Chemistry |
Volume | 37 |
Issue number | 6 |
DOIs | |
State | Published - Jun 2008 |
Keywords
- Activity coefficients
- Empirical relationships
- Protonation constants
- SIT and Pitzer models
- Solubility
- Thioacetates
ASJC Scopus subject areas
- Biophysics
- Biochemistry
- Molecular Biology
- Physical and Theoretical Chemistry