Structural Studies of Fluorenyllithium Complexes Using 7Li Solid-State NMR Spectroscopy

✍ Scribed by Dan Johnels; Anders Andersson; Arne Boman; Ulf Edlund

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 459 KB
• Volume: 34
• Category: Article
• ISSN: 0749-1581
• DOI: 10.1002/(sici)1097-458x(199611)34:11<908::aid-omr998>3.0.co;2-n

✦ Synopsis

The effect on the solid-state '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.