Nitrogen-15 Chemical Shifts in Metal-Ammine Complexes. I. Pentaamminecobalt(iii) Complexes

Nitrogen-15 chemical shifts have been measured directly for [CoX(NH3)5]n+(X=NH3,H2O,Br− and NO2−). The chemical shifts induced by paramagnetic anisotropy of Co(III) ion are of minor importance to the 15N chemical shifts, in contrast with the previous result that they are of dominant importance to the 1H chemical shifts in the same substances. According to the change of X, the 15N chemical shifts of NH3 trans and cis to X show different values.