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Explain the following : (i) Low spin ...

Explain the following :
(i) Low spin octahedral complexes of nickel are not known.
(ii) The `pi` - complexes are known for transition elememts only.
(iii) CO is a stroger ligand than `NH_(3)` for many metals.

Text Solution

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(i) For ocahedral complexes , coordination number should be 6. Since , the electronic configuration of Ni is `[Ar] 3d^(8)4s^(2)`. Which can only form the tetrahedral complexes.
(ii) Transition metals/ ions have empty d- orbitals into which the electron - pair can be donated ligands containing `pi` electrons. For example `CH_(2)=CH_(2),C_(5)H_(5)andC_(6)H_(6)`,etc.
CO and `NH_(3)` both are unidentate ligand . But CO is stronger ligand than `NH_(3)` due its large size.
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