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Standard XII

Chemistry

Crystal Field Split in Octahedral Complexes

i What type o...

Question

(i) What type of isomerism is shown by the complex $[C r (H_{2} O)_{6}] C l_{3}$ ?
(ii) On the basis of crystal field theory, write the electronic configuration for $4 d$ ion if $Δ_{0} > P$ .
(iii) Write the hybridization and shape of $[C o F_{6}]^{3 -}$ (Atomic number of Co=27).

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Solution

(i) Hydrate isomerism shown by the complex $[C r (H_{2} O)_{6}] C l_{3}$
$[C r (H_{2} O)_{5} C l] C l_{2} (H_{2} O)$ ; $[C r (H_{2} O)_{3} C l_{3}]_{3} (H_{2} O)$
(ii) Since $Δ_{o} > P$ , it is on splitting $t_{2 g}^{4} e g^{o}$ .
(iii) $[C o F_{6}]^{3 -}$ : $s p^{3} d^{2}$ hybridization and octahedral shape $C o^{3 +}$ .

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Q. (i) Draw the geometrical isomer of complex

[P t (N H_{3})_{2} C l_{2}]

.
(ii) On the basis of crystal field theory, write the electronic configuration for

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Δ_{0} < P

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(iii) Write the hybridization and magnetic behaviour of the complex

[N i (C O)_{4}]

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(At. no. of Ni=28).

(i) Draw the geometrical isomers of complex $[C o (e n)_{2} C l_{2}]^{+}$ .

(ii) On the basis of crystal field theory, write the electronic configuration for d⁴ ion if $Δ_{0} > P$ .

(iii) $[N i C l_{4}]^{2 -}$ is paramagnetic, while $[N i (C O)_{4}]$ is diamagnetic, though both are tetrahedral. Why? (Atomic number of Ni = 28)

Q. What is meant by crystal field splitting energy ? On the basis of crystal field theory, write the electronic configuration of

d^{4}

in terms of

t_{2 g}

and

e_{g}

in an octahedral field when
(i)

Δ_{0} > P

(ii)

Δ_{0} < P

Q. (i)Draw the geometrical isomers of complex

[C o (e n)_{2} C l_{2}]^{+} .

(ii) On the basis of crystal field teory, write the electronic configuration for

d^{4}

ion if

Δ_{0} > P .

(iii)

[N i C l_{4}]^{2 -}

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is diamagnetic, though both are tetrahedral. Why? (Atomic number of Ni =28)

Give the electronic configuration of the following complexes on the basis of crystal field splitting theory. $[C o F_{6}]^{3 -}, [F e (C N)_{6}]^{4 -}$ and $[C u (N H_{3})_{6}]^{2 +} .$

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(i) What type of isomerism is shown by the complex [Cr(H2O)6]Cl3?(ii) On the basis of crystal field theory, write the electronic configuration for 4d ion if Δ0>P.(iii) Write the hybridization and shape of [CoF6]3−(Atomic number of Co=27).

(i) Hydrate isomerism shown by the complex [Cr(H2O)6]Cl3 [Cr(H2O)5Cl]Cl2(H2O);[Cr(H2O)3Cl3]3(H2O)(ii) Since Δo>P, it is on splitting t42gego.(iii) [CoF6]3− : sp3d2 hybridization and octahedral shape Co3+.

(i) What type of isomerism is shown by the complex $[C r (H_{2} O)_{6}] C l_{3}$ ?
(ii) On the basis of crystal field theory, write the electronic configuration for $4 d$ ion if $Δ_{0} > P$ .
(iii) Write the hybridization and shape of $[C o F_{6}]^{3 -}$ (Atomic number of Co=27).