Question

Discuss the nature of bonding in the following coordination entity on the basis of valence bond theory:

[Co(OX)₃]³⁻

Answer 1

Electronic configuration of Co (Z = 27) = [Ar] 3d⁷4s²

Electronic configuration of Co³⁺ = [Ar] 3d⁶4s⁰

OX₃ is a strong field ligand due to which electrons are paired.

Hence, it is clear that [Co(OX)₃]³⁻ is a diamagnetic and octahedral complex.

[Co(OX)₃]³⁻ involves d²sp³ hybridization, forms an octahedral, inner orbital complex as per valence bond theory.