Intramolecular screening effects on nuclear magnetic resonance chemical shifts. Part II. The anisotropy in the magnetic susceptibility of C–F and C–Cl bonds
- 1 January 1968
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 518-522
- https://doi.org/10.1039/j19680000518
Abstract
Values, apparently representing the anisotropies in the magnetic susceptibilities of the C–F and C–Cl bonds, are determined from 1H n.m.r. shifts. It is suggested that apparent Δχ values for some bonds may fortuitously accommodate electronegativity and electric-field effects characteristic of the bonds. Because of this it is concluded that the values for Δχ CF and Δχ CCI deduced herein and for Δχ CH and Δχ CC reported previously, need not represent actual bond anisotropies. Even so, it is shown that the values deduced to represent Δχ CF and Δχ CCI can be used to account for differences in proton shifts in diverse molecular situations by using a bond-induced point magnetic dipole approach. The points of action of the effective dipoles induced in the bonds are determined.Keywords
This publication has 0 references indexed in Scilit: