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The origin of aromatic solvent‐induced shifts in 19 F n.m.r.
Author(s) -
Takada Kanako,
Nakagawa Naoya,
Nikki Kunio,
Kimura Hiroshi
Publication year - 1977
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270090214
Subject(s) - solvent , chemical shift , chemistry , spectral line , organic solvent , solvent effects , organic chemistry , physics , chemical engineering , engineering , astronomy
Aromatic solvent‐induced shifts (ASIS) in 19 F n.m.r. spectra of several organic fluoro compounds have been determined in several solvents. 19 F n.m.r. signals of unsaturated fluoro compounds in C 6 F 6 and C 6 H 6 show excess high field shifts corresponding to the term σ c (solvent shift caused by chemical interactions). The mechanism of this shift is discussed in connection with the presence of an F‐π interaction. A thermal study also supports this idea.