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Question
Discuss the nature of bonding in the following coordination entity on the basis of valence bond theory:
[Co(C2O4)3]3−
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Solution
Electronic configuration of Co (Z = 27) = [Ar] 3d74s2
Electronic configuration of Co3+ = [Ar] 3d64s0
\[\ce{C2O^{2-}_4}\] is a strong field ligand due to which electrons are paired.
Oxalate is a strong field ligand. Therefore, it cannot cause the pairing of the 3d orbital electrons. As there are 6 electrons, the hybridisation has to be sp3d2. [Co(C2O4)3]3− involves d2sp3 hybridisation, forms an octahedral, inner orbital complex as per valence bond theory. Hence, it is clear that [Co(C2O4)3]3− is a diamagnetic and octahedral complex.
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