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The one that can exhibit highest paramagnetic behaviour among the following is : gly = glycinate; bpy = 2,2'-bipyridine

1. [Fe(en)(bpy)(NH3)2]2+
2. [Ti(NH3)6]3+
3. [Pd(gly)2]
4. [Co(OX)2(OH)2]- (Δo > P)

Correct answer: [Co(OX)2(OH)2]- (Δo > P)

Solution

Cobalt in the complex [Co(OX)2(OH)2]- has unpaired electrons in its d-orbitals, which contributes to its strong paramagnetic behavior. The presence of ligands that create a strong field (Δo > P) enhances the splitting of the d-orbitals, allowing for more unpaired electrons, thus increasing paramagnetism.

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