Questions/Coordination Compounds/Why does $$[Fe(H_2O)...
Crystal Field Theory (CFT)Coordination Compounds

Why does [Fe(H2O)6]3+[Fe(H_2O)_6]^{3+} have a magnetic moment of 5.92BM while [Fe(CN)_6]^{3-}$$ is only 1.74 BM?

Expert Answer

Ligand Strength. H2OH_2O is a weak field ligand (High Spin, 5 unpaired e−). CNCN^- is a strong field ligand (Low Spin, causing pairing, leaving only 1 unpaired ee^-).

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