Which of the following reactions do square planar complexes undergo?
#a)# oxidative addition
#c)# ligand dissociation
#d)# migratory insertion
If the transition metal has a low oxidation state, the square planar complex generally undergoes oxidative addition, as it is easy to oxidize a metal with a low oxidation state.
Square planar complexes generally only undergo:
- oxidative addition reactions to form higher-coordinate complexes (octahedral products are common), if the oxidation state of the central metal is low.
- substitution reactions under an associative interchange mechanism,
#I_a#, if the oxidation state of the central metal is not low.
On the other hand...
- ligand dissociation tends to occur in complexes that are 5- or 6-coordinate, though it is possible for it to be an intermediate step in a longer reaction.
- migratory insertion generally occurs in complexes where ligands are cis to each other, often seen in octahedral complexes.
- reductive elimination is generally seen in 5- or 6-coordinate complexes with central metals of high oxidation states.