## Abstract Blue potassium solution in THF containing 18‐crown‐6 was investigated by means of ^39^K NMR spectroscopy. The presence of potassium anions and complexed potassium cations was demonstrated. Spin‐lattice and spin‐spin relaxation times were measured in the temperature range 176–295 K. An a
39K NMR study of potassium naphthalenide solutions
✍ Scribed by Maria Sokói; Janusz Grobelny; Marek Kowalczuk
- Publisher
- John Wiley and Sons
- Year
- 1991
- Tongue
- English
- Weight
- 576 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
Potassium naphthalenide solutions in tetrahydrofuran were studied by means of ^39^K NMR spectroscopy. The effect of temperature, concentration and potassium cation complexation on paramagnetic shift and relaxation behaviour was demonstrated and is discussed. An attempt was made to assess the contributions due to the various relaxation mechanisms operating at different temperatures in the systems studied.
📜 SIMILAR VOLUMES
## Abstract The hyperfine shift reagent, TmDOTP^5−^, was used to resolve the ^39^K NMR resonances of intra‐ (K~i~^+^) and extracellular (K~e~^+^) potassium in isolated, perfused guinea pig hearts. [K~i~^+^] as measured by ^39^K NMR was 25.9 ± 10.3 mM, compared with 114.4 ± 10.8 mM as measured by at
## Abstract ^39^K NMR spectroscopy was used to study a blue potassium solution in tetraglyme containing 18‐crown‐6 and in a solution without the crown ether. Direct proof of the existence of potassium anions and complexed potassium cations in both solutions has been presented.
## Abstract The ^1^H and ^39^K longitudinal relaxation times (__T__~1~) and ^1^H diffusion coefficients were measured to investigate the complex formation of 1,6‐anhydro‐β‐maltotriose and potassium ions. Although the ^1^H‐__T__~1~ values of H3′, H5′, H1″ and H4″ decreased in the presence of potassi