## 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
Complexation of potassium cations by tetraglyme and 18-crown-6 as evidenced by 39K NMR spectroscopy
✍ Scribed by Janusz Grobelny; Maria Sokól; Zbigniew J. Jedliński
- Publisher
- John Wiley and Sons
- Year
- 1991
- Tongue
- English
- Weight
- 171 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0749-1581
No coin nor oath required. For personal study only.
✦ Synopsis
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.
📜 SIMILAR VOLUMES
## Abstract Chiral discrimination studies using (+)‐(18‐crown‐6)‐2,3,11,12‐tetracarboxylic acid (18‐C‐6‐TA) as a chiral selector were performed by high‐performance liquid chromatography (HPLC) and NMR spectroscopy. The enantiomers of alanine (Ala) or alanine methyl ester (Ala‐ME) were well separate
## Abstract __Erythro__ and __threo__ configurational assignments have been made for 11 β‐fluoro‐α‐amino acids or esters using the effect of complexation of the ammonium group by 18‐crown‐6 ether on the ^19^F NMR parameters. For the __erythro__ configurations, ^3^__J__(HF) increases and a high‐fiel
## Abstract Complexation of amino acids as their sodium and potassium salts by optically active diaza crown ethers has been investigated in transport across bulk liquid membranes containing the carriers and in extraction experiments. The observed enantioselectivity was achieved by (noncovalent) ste