Festkörper-NMR-spektroskopische Studien zur Kernquadrupolwechselwirkung der Nuklide Lithium-7 und Natrium-23

In the current thesis a number of selected lithium and sodium organic compounds
were investigated by solid state NMR. The characterization of all complexes was
achieved by using multi nuclear 1D and 2D NMR measurements. The sodium organic
compounds were sodium aryl complexes with the mono- and bidentate nitrogen
ligands TMEDA, TMPDA and PMDTA. By simulating the experimental spectra quadrupolar
coupling constants ranging from 2 to 3MHz were found for the sodium organic
compounds for the first time. Furthermore three diorganolithiumcuprates with
solvent separated lithium species were investigated with regard to their quadrupolar
parameters. Typical quadrupolar coupling constants for this type of ate-complexes
were found ranging from 18 to 30 kHz with an asymmetry parameter from 0.25 to
0.50. Additionally the investigation of the dynamic behaviour of the complex ligand
TMEDA of another lithium aryl compound was carried out by line shape analysis and
measurement of the longitudinal relaxation time in the rotating frame. This investigation
yielded the energy barrier for the inversion of the chelate ring and the 180 °
flip of the ligand which were compared to other previously investigated compounds.