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7Li solid-state NMR spectroscopic study of cyclopentadienyllithium complexes

✍ Scribed by Dan Johnels; Arne Boman; Ulf Edlund

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 230 KB
Volume: 36
Category: Article
ISSN: 0749-1581
DOI: 10.1002/(sici)1097-458x(199806)36:13<s151::aid-omr311>3.0.co;2-m

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✦ Synopsis

Eighteen cyclopentadienyllithium complexes were studied by solid-state 7Li NMR spectroscopy. It is shown that the chemical shift gives information on the type of complex, i.e. whether the complex is a contact ion pair, a solvent-separated ion pair, a sandwich structure or a polymeric material. These shift di †erences are due to the ring current of the aromatic anion. In order to obtain information about the solvation of the lithium cation, the quadrupolar coupling constant s has to be determined. The s value depends on the number and type of donor atoms in the ligand, where the nitrogen-containing ligands give rise to higher s values than the oxygen analogues.

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