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29/28 , 30/28 Silicon, 34/32 sulfur and 80/77 selenium isotope‐induced fluorine chemical shifts through two bonds
Author(s) -
Tordeux Marc,
Magnier Emmanuel,
Guidotti Jérôme,
Diter Patrick,
Wakselman Claude
Publication year - 2004
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.1422
Subject(s) - chemistry , heteroatom , fluorine , chemical shift , isotope , kinetic isotope effect , chemical bond , sulfur , silicon , selenium , crystallography , analytical chemistry (journal) , radiochemistry , atomic physics , deuterium , organic chemistry , ring (chemistry) , physics , quantum mechanics
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 2 Δ 19 F(X) through two bonds were measured for the heteroatom (X = 29/28 Si, 30/28 Si, 34/32 S and 80/77 Se). The 1 Δ 19 F( 13/12 C) values for the carbon bonded to the fluorine atoms were also recorded. Examination of the 19 F 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.