CBSE Class 12 · 2011 · All India · Coordination CompoundsShort Answer

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Explain the terms, giving a suitable example in each case:
i) ambident ligand
ii) denticity of a ligand
iii) crystal field splitting in an octahedral field

Solution

(i) Ambident(ate) ligand — possesses two different donor atoms and binds through either one: NO

_{2}^{-}

(through N as nitrito-N, or O as nitrito-O), SCN

^{-}

.
(ii) Denticity — the number of donor atoms through which a ligand attaches to one metal ion: H

_{2}

O is monodentate (1), en is bidentate (2), EDTA

^{4 -}

is hexadentate (6).
(iii) Crystal field splitting (octahedral): the six ligands raise the energy of the d-orbitals unequally — d

_{x^{2} - y^{2}}

, d

_{z^{2}}

_{g}

, pointing at ligands) rise while d

_{x y}

, d

_{y z}

, d

_{z x}

_{2 g}

) fall; the separation is Δ

_{0}

. Example: the colour of [Ti(H

_{2}

_{6}

]

^{3 +}

from its t

_{2 g}

→e

_{g}

transition.

CBSE Class 12 Board · 2011 · All India · Subjective

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CBSE Class 12 · 2011 · All India · Coordination CompoundsShort Answer

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