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When degenerate d-orbitals of an isolate...

When degenerate d-orbitals of an isolated atom/ion come under influence of magnetic field of ligands, the degeneracy is lost. The two sets `t_(2g)(d_(xy),d_(yz),d_(xz))ande_(g)(d_(z^(2)),d_(x^(2)-y^(3)))` are either stabilized or destabilized depending upon the nature of magnetic field. It can be expressed diagramatically as : Value of CFS depends upon nature of ligand and a spectro-chemical series has been made experiment-ally, for tetrahedral complexes `Delta_(i)` is about 4/9 times to `Delta_(0)` (CFSE for octahedral complexes).

The energy lies in visible region and i.e., why electronic transition `t_(2_(g))hArre_(g)` are responsible for colour. Such transitions are not possible with `d^(0)` and `d^(10)` configuration.
For an octahedral complex, which of the following d'-electron configuration will give maximum CFSE?

A

High spin `d^(6)(-0.4)`

B

Low spin `d^(4)(-1.6)`

C

Low spin `d^(5)(-2.0)`

D

High spin `d^(7)(-0.8)`

Text Solution

Verified by Experts

The correct Answer is:
C
In presence of a strong field ligand, the crystal field splitting will be high `(PEltDelta_(0))`
`{:(d^(3)," "t_(2g)^(3)eg^(0)," "-1.2Delta_(0)),(d^(4)," "t_(2g)^(4)eg^(0)" "-1.6Delta_(0)),(d^(5)," "t_(2g)^(4)eg^(0)," "-2.0Delta_(0)):}`
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When degenerate d-orbitals of an isolated atom/ion come under influence of magnetic field of ligands, the degeneracy is lost. The two sets t_(2g)(d_(xy),d_(yz),d_(xz))ande_(g)(d_(z^(2)),d_(x^(2)-y^(3))) are either stabilized or destabilized depending upon the nature of magnetic field. It can be expressed diagramatically as : Value of CFS depends upon nature of ligand and a spectro-chemical series has been made experiment-ally, for tetrahedral complexes Delta_(i) is about 4/9 times to Delta_(0) (CFSE for octahedral complexes). The energy lies in visible region and i.e., why electronic transition t_(2_(g))hArre_(g) are responsible for colour. Such transitions are not possible with d^(0) and d^(10) configuration. Cr^(3+) form four complexes with four different ligands which are [Cr(Cl)_(6)]^(3-),[Cr(H_(2)O)_(6)]^(3+),[Cr(NH_(3))_(6)]^(3+) and [Cr(CN)_(6)]^(3-) . The order of CFSE (Delta_(a)) in these complexes is :

When degenerate d-orbitals of an isolated atom/ion come under influence of magnetic field of ligands, the degeneracy is lost. The two sets t_(2g)(d_(xy),d_(yz),d_(xz))ande_(g)(d_(z^(2)),d_(x^(2)-y^(3))) are either stabilized or destabilized depending upon the nature of magnetic field. It can be expressed diagramatically as : Value of CFS depends upon nature of ligand and a spectro-chemical series has been made experiment-ally, for tetrahedral complexes Delta_(i) is about 4/9 times to Delta_(0) (CFSE for octahedral complexes). The energy lies in visible region and i.e., why electronic transition t_(2_(g))hArre_(g) are responsible for colour. Such transitions are not possible with d^(0) and d^(10) configuration. The value of CFSE (Delta_(a)) for complexes given below follow the order: {:([Co(NH_(3))_(6)]^(3+),[Rh(NH_(3))_(6)]^(3+),[Ir(NH_(3))_(6)]^(3+)),("(I)","(II)","(III)"):}

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