P value is constant for a given metal ion. Finally, ammonia is weak field ligand but in certain cases, it acts as a strong field ligand (example: for Cobalt). For Fe, ammonia is a weak field ligand. Hence no pairing takes place.Click to see full answer. Besides, is nh3 a weak or strong ligand?Being lewis bases(those who donate electrons) the ligands with less electronegativity will be stronger. Therefore, in general halogen or oxygen donors (eg-F-,Cl-,Br-,H2O)are weak field ligands and the ones in which carbon or nitrogen atom is the donor (eg-CN-,CO,NH3) are strong field ligands.Also, what type of ligand is nh3? NH 3 is a weak ligand in general cases but in case of elements like Cobalt and few others NH 3 acts as a strong field ligand and pairs up the lone pair electrons. In this regard, why is nh3 a strong ligand? NH3 is a ligand with medium field strength. This is because its sigma donating capability is not very strong, and more importantly, it is neither a pi acceptor non a pi donor. That is why NH3 ligand is located at middle of the “Spectrochemical Series” for ligand strength.Why is water a weak field ligand than ammonia?In case of H2O, it is weaker ligand as compared to NH3 as the donor atom is Oxygen which is more electronegative than Nitrogen. So as the electronegativity of central atom decrease, the ligand becomes stronger. so in NH3, pairing will occur and in H2O pairing will not occur.
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