A LI-6-C-13 REDOR STUDY OF THE TMEDA COMPLEX OF SOLID FLUORENYLLITHIUM

The solid-state structure of the TMEDA complex of fluorenyllithium is investigated by the Li-6-C-13 REDOR NMR experiment. The REDOR experime nt was performed on Li-6-enriched samples with detection of the natura l abundance C-13-signal. This simplifies the interpretation of the dat a and also the sample preparation. The dipole-dipole couplings between the Li-6 cation and the C-13 nuclei, determined with the REDOR sequen ce, yields direct structural information. The distance information is also helpful when assigning the solid-state C-13 NMR spectrum. The pos ition of the Li cation is determined to within +/-0.2 Angstrom (with r espect to the fluorenyl framework).