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Standard XII

Chemistry

Introduction to CFT

The complex f...

Question

The complex for which the calculation of crystal field splitting can be most easily done, by knowing its absorption spectrum, will be :

[T i C l_{6}]^{2 -}

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[F e (H_{2} O)_{6}]^{2 +}

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[T i (C N)_{6}]^{3 -}

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[C o F_{6}]^{3 -}

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Solution

The correct option is C $[T i (C N)_{6}]^{3 -}$
The complex for which the calculation of crystal field splitting can be most easily done, by knowing its absorption spectrum, will be $[T i (C N)_{6}]^{3 -}$
In $[T i (C N)_{6}]^{3 -}$ , the Ti(III) ion has one electron in 3d subshell. Thus, it is one electron complex.
Note: The calculation of crystal field splitting can be most easily done by observing the absorption spectrum of one $e^{-}$ complex.
For multi-electronic $(d^{2} t o d^{10})$ system, the calculation of $Δ_{0}$ by absorption spectrum is not that easy as the absorption spectrum will also be affected by electron-electron repulsion.

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Similar questions

With the help of CFT number of unpaired electron in a compound can be calculated and we can calculate its paramagnetic moment (due to spin only), by the formula :

μ, = \sqrt{n (n + 2)}

Bohr magneton (BM), where 'n' is the number of unpaired electron in the complex. For spectral analysis the separation between

t_{2 g}

and

e_{g}

orbitals, called ligand field splitting parameter

Δ_{0}

(for octahedral complexes) should be known to us, which can be easily calculated by observing the absorption spectrum of one

e^{-}

complex figure shows the optical absorptions spectrum of the

d^{1}

hexaaqatitanium (III) ion

[T i (H_{2} O)_{6}]^{3 +}

. The CFT assigns the first absorption maximum at 20,300

c m^{- 1}

to the transition

e_{g} \leftarrow t_{2 g}

. For multielectronic

(d^{2} t o d^{10})

system, the calculation of

Δ_{0}

by absorption spectrum is not that easy as the absorption spectrum will also be affected by electron-electron repulsions.

The crystal field stabilization energy (CFSE) for complex given in the passage,

[T i (H_{2} O)_{6}^{3 +}

will be (in kJ / mol) :

Q. The crystal field splitting energy CFSE

(I n Δ_{0} u n i t s)

for

[C o F_{6}]^{3 -}

will be:

Q. The colour of the coordination compounds depends on the crystal field splitting. What will be the correct order of absorption of wavelength of light in the visible region, for the complexes,

[C o (N H_{3})_{6}]^{3 +}, [C o (C N)_{6}]^{3 -}, [C o (H_{2} O)_{6}]^{3 +}

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 $[C u (N H_{3})_{6}]^{2 +} .$

Q. Give the electronic configuration of the following on the basis of crystal field splitting theory.

{[C o F_{6}]}^{3 -}

and

{[C u {({N H}_{3})}_{6}]}^{2 +}

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