Question

The one that can exhibit highest paramagnetic behaviour among the following is:

विकल्प

• [Fe(en)(bpy)(NH₃)₂]²⁺

• [Pd(gly)₂]

• [Ti(NH₃)₆]³⁺

• [Co(ox)₂(OH)₂]⁻ (Δ_o > P)

Answer 1

[Co(ox)₂(OH)₂]⁻ (Δ_o > P)

Explanation:

• [Co(ox)₂(OH)₂]⁻ is Co³⁺ has a 3d⁶ configuration. With weak field ligands like oxalate (ox) and hydroxide (OH), it remains in a high-spin state, resulting in 4 unpaired electrons. This leads to strong paramagnetic behaviour. Additionally, the high-spin nature of this complex is favoured by the condition Δ_o > P, which means the crystal field splitting energy (Δ_o​) is greater than the pairing energy (P), allowing for more unpaired electrons.
• The other complexes have fewer unpaired electrons, resulting in weaker paramagnetic behaviour.

Thus, [Co(ox)₂(OH)₂]⁻ exhibits the highest paramagnetic behaviour.