. Low spin octahedral complexes of nickel are not known


Explain the following

(i) Low spin octahedral complexes of nickel are not known.

(ii) The complexes-complexes are known for transition elements only.

(iii) CO is a stronger ligand than NH3 for many metals.

                                                                  OR

Compare the following complexes with respect to structural shapes of units, magnetic behaviour and hybrid orbitals involved in units

(i) [Ni(CN)4 ] 2-

(ii) [NiCl4 ] 2-

(iii) [CoFe6 ] 3-

[At. Nos,: Ni = 28; Co = 27]

Best Answer

(i) Ni in its atomic ionic state can not afford two vacant 3d orbitals hence d2 sp3 hybridisation is not possible

molecular orbita

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