Which of the following complex ions has the central metal ion with the crystal field electronic configuration t_ 2g ^3 e_g^2 ?

Step-by-step solution

The given electronic configuration is t_ 2g ^3 e_g^2 . Total number of d-electrons = 3 + 2 = 5 . Thus, the central metal ion must have a d^5 configuration. Since the electrons have entered the higher energy e_g orbitals before pairing in the t_ 2g orbitals, the complex must be a high-spin complex. This occurs when the crystal field splitting energy is less than the pairing energy ( _o Evaluating the options: 1) [Fe(H₂O)₆]³⁺ : Fe is in +3 oxidation state ( d^5 ). H₂O is a weak field ligand, so it forms a high-spin c