The concentration dependences of the stability constants of iodine-iodide-amylose complexes in aqueous solutions of electrolytes

被引：0

作者：

Agafonov, AV ^{[1
]}

Vladimirov, AV ^{[1
]}

Volkova, TV ^{[1
]}

机构：

[1] Russian Acad Sci, Inst Chem Solut, Ivanovo, Russia

来源：

RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY | 2004年 / 78卷 / 09期

关键词：

D O I：

暂无

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 thermodynamic characteristics of complex formation between iodine-iodide particles and amylose in aqueous solutions of electrolytes (LiCl, KCl, CsCl, KNO3, and CaCl2) at 298.15 K were studied by potentiometry. The equilibrium constants for this process (log K (1/n)) were determined. The temperature dependences (T = 283.15-313.15 K) of the constants in solutions of KCl and CaCl2 were used to calculate the enthalpy and entropy of complex formation. Different electrolyte effects on the ionic strength dependence of log K-1/n In were explained by the competition between the I-3(-) and I2Cl- ions for entering the amylose helix cavity and the influence of electrolytes on the interphase distribution of these ions and the solvation state of the low-molecular-weight reagents, amylose, and complexes in solution.

引用

页码：1388 / 1391

页数：4

共 9 条

[1]

ABROSIMOV VK, 2001, BIOACTIVE COMPOUNDS

[2]

AGAFONOV AV, 2002, CONCENTRATED SATURAT, P119

[3]

Borodin V.A., 1985, MATH PROBLEMS CHEM T, P219

[4]

BORODIN VA, 1986, ZH NEORG KHIM+, V31, P10