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Structural Studies of Fluorenyllithium Complexes Using 7 Li Solid‐State NMR Spectroscopy
Author(s) -
Johnels Dan,
Andersson Anders,
Boman Arne,
Edlund Ulf
Publication year - 1996
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(199611)34:11<908::aid-omr998>3.0.co;2-n
Subject(s) - chemistry , carbanion , delocalized electron , coupling constant , chemical shift , lithium (medication) , solid state nuclear magnetic resonance , nuclear magnetic resonance spectroscopy , spectroscopy , conjugated system , computational chemistry , nuclear magnetic resonance , crystallography , stereochemistry , organic chemistry , polymer , medicine , physics , particle physics , quantum mechanics , endocrinology
The effect on the solid‐state 7 Li chemical shifts and quadrupolar coupling constants of different locations of the lithium cation relative to the carbanion framework of delocalized carbanions was investigated. When the lithium cation is situated above the conjugated system, the chemical shift is about ‐7 ppm as expected, and around ‐2 ppm otherwise. The quadrupolar coupling constant is very sensitive to changes in the lithium cation position and to changes in coordination. The value varies between 27 and 262 kHz. A combination of chemical shifts and quadrupolar coupling constants is necessary to retrieve the correct structural information.