29/28, 30/28Silicon, 34/32sulfur and 80/77selenium isotope-induced fluorine chemical shifts through two bonds.
Magn Reson Chem
; 42(8): 700-3, 2004 Aug.
Article
en En
| MEDLINE
| ID: mdl-15248258
ABSTRACT
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 2delta19F(X) through two bonds were measured for the heteroatom (X = 29/28Si, 30/28Si, 34/32S and 80/77Se). The 1delta19F(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.
Buscar en Google
Colección:
01-internacional
Banco de datos:
MEDLINE
Idioma:
En
Revista:
Magn Reson Chem
Asunto de la revista:
QUIMICA
Año:
2004
Tipo del documento:
Article
País de afiliación:
Francia