What are π-acceptor and π-donor ligands?

Π-acceptor Ligands: Those ligands which empty π-orbitals with correct symmetry to overlap with the metal t2g orbitals forming metal to ligand π-bonds are called π-acceptor ligands. Eg CO, CN- NO- etc

π-donor ligands :
Those ligands which have filled π-orbitals with correct symmetry to overlap with the metal t2g orbitals forming ligand to metal π-bonds are called π-donor ligands eg.Halide ions, OH- NO3-

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Thank you !