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  4. What is the most likely configuration of the cobalt d-electrons for the species, [CoCl6]3- and [Co(NO2)6]3-?

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Q. What is the most likely configuration of the cobalt d-electrons for the species, $[CoCl_6]^{3-}$ and $[Co(NO_2)_6]^{3-}$?

Coordination Compounds

Solution:

Weak field ligands (like $Cl^-$) giving low value of $\Delta_{o}$, form high spin octahedral complexes whereas strong field ligands (like $NO^-_ 2$) give rise to low spin (spin paired) complexes.