Question

Write short notes on synergic bonding.

Answer 1

Synergic bonding:-

Synergic bonding is also known as Pi-backbonding. It is usually used in the context of organometallic chemistry where there is a transition metal centre and good pi-acceptor ligands like $CO$. In such a case, there are two bonding interactions at a time. Firstly donation of electrons from the ligand to an empty orbital on the which gives the typical ligand-metal interaction. However if the metal has filled d-orbitals, a second interaction can occur where the electrons are donated from the filled d orbitals on the metal to an empty orbital of the ligand (typically a Pi antibonding orbital). Together, these two interactions make up synergic bonding.