Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
A ⇒ Spin only magnetic moment of [Fe(CN)6]–3 is 1.73 B.M. and [Fe(H2O)6]+3 is 5.92 B.M.
R ⇒ In both cases Fe have +3 oxidation state
In the light of the above statements, write the detailed answer:
A ⇒ Spin only magnetic moment of [Fe(CN)6]–3 is 1.73 B.M. and [Fe(H2O)6]+3 is 5.92 B.M.
R ⇒ In both cases Fe have +3 oxidation state
In the light of the above statements, write the detailed answer:
Approach Solution - 1
[Fe(CN)6]–3 : Fe+3 : 3d5 with S.F.L
\(⇒ n = 1 \)
Magnetic moment = \(1.73 \) B.M [Fe(H2O)6]+3 Fe+3 : 3d5 with W.F.L
\(⇒ n = 5 \)
Magnetic moment = \(5.92\) B.M
\(\text{Both A \& R are correct but R is not the correct explanation }\)
Approach Solution -2
The magnetic moment of \([Fe(H_2O)_6]^{3+}\) is 5.92 BM because it has high-spin Fe3+ (d5, S = \(\frac{5}{2}\)) and it has five unpaired electrons.
On the other hand, \([Fe(CN)_6]^{3-}\) has low-spin Fe3+ (d5, S = \(\frac{1}{2}\)) and only one unpaired electron.
Therefore, the magnetic moment of \([Fe(CN)_6]^{3-}\) is 1.73 BM, which is much lower than that of \([Fe(H_2O)_6]^{3+}\).
\(\text{The oxidation state of Fe in both complexes is indeed +3.}\)
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Concepts Used:
Coordination Compounds
A coordination compound holds a central metal atom or ion surrounded by various oppositely charged ions or neutral molecules. These molecules or ions are re-bonded to the metal atom or ion by a coordinate bond.
Coordination entity:
A coordination entity composes of a central metal atom or ion bonded to a fixed number of ions or molecules.
Ligands:
A molecule, ion, or group which is bonded to the metal atom or ion in a complex or coordination compound by a coordinate bond is commonly called a ligand. It may be either neutral, positively, or negatively charged.