Untersuchung der Komplexierung von Na+, K+, Ca2+ und Ba2+ mit einigen elektrisch neutralen Liganden durch Messung von 13C-chemischen Verschiebungen und Spin-Gitter-Relaxationszeiten
✍ Scribed by Rolf Büchi; Ernö Pretsch
- Publisher
- John Wiley and Sons
- Year
- 1977
- Tongue
- German
- Weight
- 448 KB
- Volume
- 60
- Category
- Article
- ISSN
- 0018-019X
No coin nor oath required. For personal study only.
✦ Synopsis
Investigation of the complexing of Na^+^, K^+^, Ca^2+^ and Ba^2+^ with some uncharged ligands by ^13^C‐chemical shift and spin‐lattice relaxation time measurements
The influence of Na^+^, K^+^, Ca^2+^ and Ba^2+^ ions on ^13^C chemical shifts and on spin‐lattice relaxation times of some electrically neutral ion carriers was investigated. In the solvents CD~3~CN and CD~3~OD and in presence of an excess of metal ions ligand 4 (see the Scheme) forms complexes of 1:1 stoichiometry. All four oxygen atoms of the ligand as well as solvent molecules take part in the coordination. In CDCl~3~ as solvent, for all ions investigated except sodium, only 1:2 complexes (metal/ligand) were observed with 4. Sodium ions form both 1:1 and 1:2 complexes in this solvent. In the 1:2 complexes of the investigated monovalent ions only one, in those of the divalent ions both amide carbonyl groups of ligand 4 take part in the coordination.