Thermodynamics of protolytic equilibrium of nicotinic acid in water-ethanol solutions

被引：10
|
作者：
Kuranova, N. N. [1 ]
Dushina, S. V. [1 ]
Sharnin, V. A. [1 ]
机构：
[1] Ivanovo State Univ Chem Technol, Ivanovo 153460, Russia
来源：
RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A | 2010年 / 84卷 / 05期
关键词：
AQUEOUS-SOLUTION; BENZOIC-ACID; IONIZATION; 25-DEGREES-C; PYRIDINE; KCL;
D O I：
10.1134/S0036024410050146
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The enthalpies of stepwise protonation of nicotinate ion (L(-)) in water-ethanol solvents were determined calorimetrically at 298.15 K. It was found that the reduced exothermicity of the reaction of nicotinate ion protonation upon an increase of the organic component content in solution is due mainly to increased solvation of the proton. The minor influence of solvent on the enthalpy of protonation of nicotinic acid (HL) is characterized by compensation from solvation of the proton, the ligand, and its protonated form (H(2)L(+)).
引用
收藏
页码：792 / 795
页数：4
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