9.10 The hexaquomanganese(II) ion contains five unpaired electrons, while the hexacyanoion contains only one unpaired electron. Explain using Crystal Field Theory.
9.10 The hexaquomanganese(II) ion contains five unpaired electrons, while the hexacyanoion contains only one unpaired electron. Explain using Crystal Field Theory.
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1 Answer
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[Mn (H2O)6]+2
[Mn (CN)6]4-
Oxidation state of manganese:
Overall charge balance:
X + 6 (0) = 2
X = + 2
Oxidation state of manganese:
Overall charge balance:
X + 6 (-1) = -4
X = + 2
Outer electronic configuration of Mn = d5
Outer electronic configuration of Mn = d5
H2O is a weak field ligand so it does not cause pairing of the electron. Therefore Mn undergoes sp3d2 hybridization. Geometry is octahedral.
Therefore the 5 unpaired electrons from the d orbital remain as it is.
CN is a strong field ligand so it causes pairing of the electron (5 electrons get paired to form 2 pairs and one unpaired electron). Therefore Mn undergoes d2sp3 hybridization. Geometry is octahedral.
Mn in + 2 oxidation state:
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