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Using crystal field theory, draw energy level diagram, write electronic configuration of the central metal atom/ion and determine the magnetic moment value in the following : (i) [CoF_(6)]^(3-),[Co(H_(2)O)_(6)]^(2+),[Co(CN)_(6)]^(3-) (ii) [FeF_(6)]^(3-),[Fe(H_(2)O)_(6)]^(2+),[Fe(CN)_(6)]^(4-) |
Answer» SOLUTION : `N=0, mu=sqrt(n(n+2))=0`. Hence, it is diamagnetic. (ii) `FeF_(6)^(3-)" has "Fe^(3+)=3d^(5)=t_(2g)^(3)e_(g)^(2),n=5,mu=sqrt(5(5+2))=sqrt(35)=5.92 BM` (`F^(-)` is a weak field ligand, `Delta_(0)ltP`) `[Fe(H_(2)O)_(6)]^(2+)` has `Fe^(2+)=3d^(6)=t_(2g)^(4)e_(g)^(2), n=4, mu=sqrt(4(4+2))=sqrt(24)=4.9BM` (`H_(2)O` is a weak field ligand, `Delta_(0)ltP`) `[Fe(CN)_(6)]^(4-)" has "Fe^(2+)=3d^(6)=t_(2g)^(6)e_(g)^(0), n=0, mu=0` (diamagnetic), (`CN^(-)` is a STRONG field ligand, `Delta_(0)gtP`) |
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