The pi-acid ligand which uses its d-orbital d | vedclass

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(A) In $PR_3$ (phosphine ligands),the phosphorus atom possesses vacant $d-$orbitals. These vacant $d-$orbitals can accept electron density from the me

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$PR_3$

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(A) In $PR_3$ (phosphine ligands),the phosphorus atom possesses vacant $d-$orbitals. These vacant $d-$orbitals can accept electron density from the metal $d-$orbitals through back-bonding,which is a key component of synergic bonding. Other ligands like $CO$,$NO^{+}$,and $C_6H_6$ primarily use their $\pi^*$ antibonding orbitals for back-bonding,not their $d-$orbitals.

The $\pi-$acid ligand which uses its $d-$orbital during synergic bonding in its complex compound is:

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