Hello! I analise metal chemical shifts, its formula is MR4, where M is transition metal, like Palladium,
and there is some trend:
I > CN > Br > NH3 > NO2 > Cl > H2O,
the same trend is observed for similar complex of formula: Pd(R)3Cl, Pd(NH3)2X2, Pd(R)Cl3
So, the metal signal shielding...