Heterogeneity of Critical Indexes at “Liquid–Liquid” Phase Transition in 2,6-Lutidine Aqueous Solutions: An 1H NMR Study
- Authors: Gabuda S.P.1, Kozlova S.G.1,2, Kompankov N.B.1, Redkina K.S.1,2
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Affiliations:
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Science
- Novosibirsk State University
- Issue: Vol 47, No 2 (2016)
- Pages: 149-157
- Section: Article
- URL: https://journals.rcsi.science/0937-9347/article/view/247428
- DOI: https://doi.org/10.1007/s00723-015-0733-9
- ID: 247428
Cite item
Abstract
Temperature dependences of 1H 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 1H 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 1H NMR spectra.
About the authors
Svyatoslav P. Gabuda
Nikolaev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Science
Email: sgk@niic.nsc.ru
Russian Federation, Novosibirsk
Svetlana G. Kozlova
Nikolaev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Science; Novosibirsk State University
Author for correspondence.
Email: sgk@niic.nsc.ru
Russian Federation, Novosibirsk; Novosibirsk
Nikolay B. Kompankov
Nikolaev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Science
Email: sgk@niic.nsc.ru
Russian Federation, Novosibirsk
Ksenia S. Redkina
Nikolaev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Science; Novosibirsk State University
Email: sgk@niic.nsc.ru
Russian Federation, Novosibirsk; Novosibirsk