Discuss the nature of bonding in the given coordination entities on the basis of valence bond theory:
`[Co(C_(2)O_(4))_(3)]^(3-)`

Explanation

`[Co(ox)_(3)]^(3-)` : It is an inner orbital complex with octahedral structure. `Co^(3+)` is `d^(2)sp^(3)` hybridised. Complex is diamagnetic (no unpaired electrons) in nature. [See structure or `[Co(NH_(3))_(6)]^(3+)` in article no. 9.9.3. Note, 6 electron - pairs are available from 3 oxalate ions.]