Explain the following: (i) Low spin octahedral complexes of nickel are not known.
Explain the following:
(i) Low spin octahedral complexes of nickel are not known.
(ii) The π -complexes are known for transition elements only.
(iii) CO is a stronger ligand than NH3 for many metals.
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(i) Ni in its atomic ionic state can not afford two vacant 3d orbitals hence d2 sp3 hybridisation is not possible.
(ii) Transition metals have vacant d orbitals in their atoms or ions into which the electron pairs can be donated by ligands containing π electrons, e.g., C6H6, CH2 = CH2, etc. Thus dπ-Pπ bonding is possible.
(iii) Because in case of CO back bonding takes place in which the central metal uses its filled d orbital with empty anti bonding π * molecular orbital of CO.
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