18O/16O isotope effect on miscibility of isobutyric acid with water

被引：3
|
作者：
Siporska, Agnieszka [1 ]
Makowska, Anna [1 ]
Szydlowski, Jerzy [1 ]
机构：
[1] Warsaw Univ, Fac Chem, PL-02089 Warsaw, Poland
来源：
JOURNAL OF PHYSICAL CHEMISTRY B | 2007年 / 111卷 / 40期
关键词：
D O I：
10.1021/jp074792w
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 miscibility of isobutyric acid with water and the influence of the isotope substitution of oxygen (O-16/O-18) in water over a broad concentration range are reported. The system exhibits a phase diagram with, an upper critical solution temperature (UCST) and a visible isotope effect thereon. The oxygen isotope substitution decreases the UCST, leading to better miscibility of isobutyric acid with water. The isotope shift, Delta T-c = T-c(O-18) - T-c(O-16), extrapolated to the 100% enrichment in 180, is equal to-1.15 K; hence it is much smaller and opposite to that found for deuterium substitution. The origin of the observed miscibility isotope effect has been qualitatively discussed in terms of the condensed-phase isotope effect theory.
引用
收藏
页码：11632 / 11634
页数：3
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