why NH3 act as strong field ligand as well as weak field ligand?
Answers
Answer:
Explanation:
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 coordination chemistry, a ligand is an ion or molecule (functional group) that binds to a central metal atom to form a coordination complex. The bonding between metal and ligand generally involves formal donation of one or more of the ligand's electron pairs. The nature of metal–ligand bonding can range from covalent to ionic.
There are two types of ligands. Strong field ligands and weak field ligands. Those which only cause a small extent of crystal field splitting is called weak field ligand and those which cause large splitting is called strong field ligand.