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Rubidium-87 NMR studies of rubidium salts and complexes with 18-crown-6 and cryptand-222 in solutions

Authors
Journal
Spectrochimica Acta Part A Molecular Spectroscopy
0584-8539
Publisher
Elsevier
Publication Date
Volume
39
Issue
1
Identifiers
DOI: 10.1016/0584-8539(83)80048-8
Disciplines
  • Chemistry

Abstract

Abstract Rubidium-87 NMR measurements were used to study the behavior of the Rb + ion in water, methanol, and propylene carbonate solutions. In aqueous solutions the 87Rb chemical shift varies linearly with the mean activity of the salt. In methanol and propylene carbonate solutions the relationship is linear only at high salt concentrations. The resonance lines are broad and vary from ∼ 150 Hz (at half height) in water to ∼ 1000 Hz in propylene carbonate. Additions of macrocyclic ligands 18C6 and C222 to Rb + solutions in the three solvents result in further broadening of the resonance line so that variations in the resonance frequency cannot be measured with a reasonable precision.

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