29/28, 30/28Silicon, 34/32sulfur and 80/77selenium isotope-induced fluorine chemical shifts through two bonds

• Published in: Magnetic resonance in chemistry Vol. 42; no. 8; pp. 700 - 703
• Main Authors: Tordeux, Marc, Magnier, Emmanuel, Guidotti, Jérôme, Diter, Patrick, Wakselman, Claude
• Format: Journal Article
• Language: English
• Published: Chichester, UK John Wiley & Sons, Ltd 01.08.2004; Wiley
• Subjects: 13C NMR; 19F NMR; 29Si NMR; 77Se NMR; Chemical Sciences; isotope-induced chemical shifts; NMR; Organic chemistry; selenium; silicon; sulfur; trifluoromethyl; NMR; silicon; selenium; 29Si NMR; sulfur; trifluoromethyl; 13C NMR; 77Se NMR; 19F NMR; isotope-induced chemical shifts
• ISSN: 0749-1581; 1097-458X
• DOI: 10.1002/mrc.1422

Isotope effects on fluorine chemical shifts induced by heteroatoms bonded covalently to a carbon atom bearing fluorine atoms were studied. For each compound, the isotope‐induced chemical shifts 2Δ 19F(X) through two bonds were measured for the heteroatom (X = 29/28Si, 30/28Si, 34/32S and 80/77Se). The 1Δ 19F(13/12C) values for the carbon bonded to the fluorine atoms were also recorded. Examination of the 19F NMR data showed homogeneity of the isotope‐induced chemical shifts along the rows of the periodic table and regularity down the columns (from 10 to 15 ppb per mass unit for the second row to 0.4 ppb for the fourth row). It became negligible for atoms of the fifth row. Copyright © 2004 John Wiley & Sons, Ltd.