NMR Spectroscopy Chapters 19
Peak Shifts in NMR • e- in molecule is in mag. field • e- circulate => produce secondary mag. field opposite in direction to Bo *nucleus experiences mag. Field smaller than original Bo. -nucleus is shielded -shielding related to e- density (plus exceptions)
Isotropy – same in all directions Anisotropy – depends on orientation of molecule in magnetic field.