NMR paramagnetic probing of polymer solutions using manganese(II) ions

Nuclear magnetic relaxation studies show that manganese(II) ions can serve as paramagnetic probes for investigation of aqueous solutions of polyelectrolytes (polystyrene sulfonate and polyethylenimine) and their mixtures. The analysis of the measured rates of spin–lattice ( R 1 ) and spin–spin ( R 2...

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Published inPolymer science. Series C Vol. 59; no. 1; pp. 133 - 140
Main Authors Amirov, R. R., Burilova, E. A., Zhuravleva, Yu. I., Zakharov, A. V., Ziyatdinova, A. B.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.09.2017
Springer Nature B.V
Subjects
Aqueous solutions
Chemistry
Chemistry and Materials Science
Hydration
Magnetic induction
Magnetic relaxation
Manganese
NMR
Nuclear magnetic resonance
Polyelectrolytes
Polyethyleneimine
Polymer Sciences
Polystyrene resins
Water chemistry
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Summary:Nuclear magnetic relaxation studies show that manganese(II) ions can serve as paramagnetic probes for investigation of aqueous solutions of polyelectrolytes (polystyrene sulfonate and polyethylenimine) and their mixtures. The analysis of the measured rates of spin–lattice ( R 1 ) and spin–spin ( R 2 ) relaxations reveals the differences in the binding character of manganese(II) ions with polystyrene sulfonate and polyethylenimine. In a mixture of the polymers in acidic and neutral media, manganese(II) forms two types of ternary complexes. Using the suggested method for definition of the hydration degree of a coordination sphere of the bound probe ions, the number of water molecules in the first sphere of the polymer-bound manganese(II) ions is found on the basis of the value of the R 2 / R 1 ratio.
ISSN:1811-2382
1555-614X
DOI:10.1134/S1811238217010015