1H NMR Relaxation Studies of Proton-Conducting Imidazolium Salts of Dicarboxylic Acids

. The proton nuclear magnetic resonance spin–lattice relaxation time has been successfully used to evidence the reorientation of the imidazolium rings in carboxylic acid salts of imidazole: imidazolium oxalate, imidazolium adipate monohydrate and diimidazolium suberate. The process occurs in the tem...

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Bibliographic Details
Published inApplied magnetic resonance Vol. 34; no. 1-2; pp. 163 - 173
Main Authors Rachocki, A., Pogorzelec-Glaser, K., Tritt-Goc, J.
Format Journal Article
LanguageEnglish
Published Vienna Springer-Verlag 01.07.2008
Springer Nature B.V
Subjects
Atoms and Molecules in Strong Fields
Carboxylic acids
Cell membranes
Dicarboxylic acids
Imidazole
Laser Matter Interaction
Magnetic induction
Materials selection
Melting points
NMR
Nuclear magnetic resonance
Organic Chemistry
Physical Chemistry
Physics
Physics and Astronomy
Protons
Relaxation time
Solid State Physics
Spectroscopy/Spectrometry
Spin-lattice relaxation
Imidazolium
Imidazole Ring
Nuclear Magnetic Resonance Measurement
Relaxation Measurement
Nuclear Magnetic Resonance Method
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Summary:. The proton nuclear magnetic resonance spin–lattice relaxation time has been successfully used to evidence the reorientation of the imidazolium rings in carboxylic acid salts of imidazole: imidazolium oxalate, imidazolium adipate monohydrate and diimidazolium suberate. The process occurs in the temperature range between 325 K and the melting point of the salts (523, 379 and 360 K) and is described by a single activation energy of 20, 48 and 66 kJ/mol for imidazolium oxalate, imidazolium adipate monohydrate and diimidazolium suberate, respectively. The studied salts are considered as possible candidate materials for fuel-cell membranes.
ISSN:0937-9347
1613-7507
DOI:10.1007/s00723-008-0088-6