What is pi acid ligand
Answers
π backbonding, also called π backdonation, is a concept from chemistry in which electrons move from an atomic orbital on one atom to a π* antibonding orbital on a π-acceptor ligand. ... CO is a good pi acceptor (lewis acid) due to empty pi orbitals and a good sigma donor (lewis acid)
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A example of a pi acid ligand is carbon monoxide(CO). CO is a good pi acceptor (lewis acid) due to empty pi orbitals and a good sigma donor (lewis acid).
When bonding to a metal the ligand (in this case CO) sigma donates to an empty d-orbital and the filled d-orbitals of the metal donates to the empty pi orbitals of CO, back donation.
This only occurs when the metal has an oxidation state <3+ as higher oxidative states cause electron density to contract towards the metal.