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7 Li solid‐state NMR spectroscopic study of cyclopentadienyllithium complexes
Author(s) -
Johnels Dan,
Boman Arne,
Edlund Ulf
Publication year - 1998
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/(sici)1097-458x(199806)36:13<s151::aid-omr311>3.0.co;2-m
Subject(s) - chemistry , solvation , lithium (medication) , nuclear magnetic resonance spectroscopy , ion , chemical shift , ligand (biochemistry) , solid state nuclear magnetic resonance , ring (chemistry) , solvent , coupling constant , spectroscopy , crystallography , computational chemistry , inorganic chemistry , stereochemistry , nuclear magnetic resonance , organic chemistry , physics , medicine , biochemistry , receptor , particle physics , quantum mechanics , endocrinology
Eighteen cyclopentadienyllithium complexes were studied by solid‐state 7 Li 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 differences 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 χ has to be determined. The χ value depends on the number and type of donor atoms in the ligand, where the nitrogen‐containing ligands give rise to higher χ values than the oxygen analogues. © 1998 John Wiley & Sons, Ltd.