CARBON-13 SPLITTINGS IN FLUORINE NUCLEAR MAGNETIC RESONANCE SPECTRA
Spin-spin coupling constants between Fig and directiy bonded C/sup 13/ nuclei were measured for a wide variety of organofluorine compounds. The coupling constants tend to decrease with increasing fluorine chemical shifts. It is suggested that the degree of C-- F double bond character is the most importart single parameter influencing both of the observed quartities, with increased double bonding leading to stronger C- F coupling and decreased fluorine magnetic shielding. Increasing C/sup +/- F/sup -/ ionic character apparently entails increased fiuorine shielding and reduced C--F coupling, but this effect is quantitatively less important. Increasing the s-character of the carbon orbital used in the C--F bond also appeared to reduce the magnitude of the C--F coupling constant. A number of longrange C--F, H-F, and F--F coupling constants also are reported. (auth)
- Research Organization:
- Purdue Univ., Lafayette, Ind.
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-17-011356
- OSTI ID:
- 4701083
- Journal Information:
- Journal of Physical Chemistry (U.S.), Journal Name: Journal of Physical Chemistry (U.S.) Vol. Vol: 67; ISSN JPCHA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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