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Solvent effects on the 1 H 1 H, 1 H 19 F and 19 F 19 F coupling constants of fluorobenzene and 1,2‐difluorobenzene
Author(s) -
Suntioinen Sirpa,
Laatikainen Reino
Publication year - 1992
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/mrc.1260300512
Subject(s) - fluorobenzene , chemistry , solvent , cyclohexane , solvent effects , coupling constant , acetone , hydrogen bond , molecule , organic chemistry , benzene , physics , particle physics
The 1 H and 19 F NMR spectra of fluorobenzene and 1,2‐difluorobenzene were measured in several pure solvents and in binary solvent mixtures to study the solvent dependence of 1 H 19 F and 19 F 19 F coupling constants. The solvents are distinctly divided into two groups on the basis of their hydrogen bonding properties. Most the coupling constants increase with increasing polarity of the solvent within both groups. The 3 J (F,H) and 4 J (F,H) coupling constants are typically increased by 4‐7% when the solvent is changed from cyclohexane to acetone. For the 5 J (F,H) coupling of fluorobenzene the change is as large as 70%.