9.7 [Fe(H2O)6 ] 3+ is strongly paramagnetic whereas [Fe(CN)6 ] 3– is weakly paramagnetic. Explain.
9.7 [Fe(H2O)6 ] 3+ is strongly paramagnetic whereas [Fe(CN)6 ] 3– is weakly paramagnetic. Explain.
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1 Answer
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In [Fe (H2O)6]3+
Electronic configuration of Fe is: [Ar]3d64s2
[Ar] = 1s22s22p63s23p6
Electronic configuration of Fe+3 = [Ar]3d5
Outer electronic configuration of Fe+3 = 3d5
Overall charge balance:
X + 6 (0) = 3
X = + 3
In [Fe (CN)6]3-
Overall charge balance:
X + 6 (-1) = -3
X = + 3
In both the compounds Fe is in + 3 oxidation state.
In case of [Fe (H2O)6]3+
H2O is weak field ligand so it does not pair the unpaired electron. Total no. of the unpaired electron, n =5, Spin only magnetic moment is given by:
μ = [n (n + 2)]1/2
μ = [5×7]1/2
μ = 5.916BM
In case of [Fe (CN)6]3-
CN- is a strong field ligand so it pairs up the electron.
Total no. o
...more
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