9.8 Explain [Co(NH3 )6 ] 3+ is an inner orbital complex whereas [Ni(NH3 )6 ] 2+ is an outer orbital complex.
9.8 Explain [Co(NH3 )6 ] 3+ is an inner orbital complex whereas [Ni(NH3 )6 ] 2+ is an outer orbital complex.
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1 Answer
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[Co (NH3)6]3+
[Ni (NH3)6]2+
Oxidation state of cobalt:
Overall charge balance:
X + 6 (0) = 3
X = + 3
Oxidation state of nickel:
Overall charge balance:
X + 6 (0) = 2
X = + 2
Outer electronic configuration of cobalt = d6
Outer electronic configuration of nickel = d8
NH3 is a strong field ligand so it causes pairing of electron. Therefore cobalt undergoes
d2sp3 hybridisation. As in the hybridisation d2 orbitals are used from the (n-1)d orbitals (inner orbitals as n = 4 being quantum number) . hence it is a inner orbital complex.
NH3 is a strong field ligand so it causes pairing of electron. Therefore, nickel undergoes sp3 d2 hybridisation. As in the hybridisation, d2 orbitals are used from the and orbitals (outer orbitals as n = 4 being quantum number). Hence, it is an outer orbital complex
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