Heterogeneity of Critical Indexes at "Liquid-Liquid" Phase Transition in 2,6-Lutidine Aqueous Solutions: An 1H NMR Study

被引：3

作者：

Gabuda, Svyatoslav P. ^{[1
]}

Kozlova, Svetlana G. ^{[1
,2
]}

Kompankov, Nikolay B. ^{[1
]}

Redkina, Ksenia S. ^{[1
,2
]}

机构：

[1] Russian Acad Sci, Nikolaev Inst Inorgan Chem, Siberian Branch, Novosibirsk, Russia

[2] Novosibirsk State Univ, Novosibirsk 630090, Russia

来源：

APPLIED MAGNETIC RESONANCE | 2016年 / 47卷 / 02期

基金：

俄罗斯基础研究基金会;

关键词：

BINARY-MIXTURE; CRITICAL-POINT; WATER; NMR; APPROXIMATION; BEHAVIOR; ENERGY; SYSTEM;

D O I：

10.1007/s00723-015-0733-9

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

摘要：

Temperature dependences of H-1 nuclear magnetic resonance (NMR) splitting signals of 2,6-lutidine aqueous solutions were studied in the vicinity of lower critical solution temperatures. The splitting of H-1 NMR signals was considered as an order parameter at "liquid-liquid" phase transition. It was discovered that critical indices to determine the behavior of the order parameter are different (i.e., demonstrate heterogeneity) for structurally non-equivalent hydrogen atoms of the 2,6-lutidine molecule. An isotope effect associated with van der Waals interactions was registered in the obtained H-1 NMR spectra.

引用

页码：149 / 157

页数：9

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