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What is crystal field stabilization ener...

What is crystal field stabilization energy (CFSE) ?

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The crystal field stabilisation energy is definedas the energy difference of electronic configurations in the ligand field ` (E_(LF))` and the isotropic field ` (E_(iso ) ) `
CFSE `(Delta E_0) ={E_(LF) }- {E_(iso )}= {[n_(t_(2g))(-0.4)+ n_(c_g) (0.6) [Delta _0+n_pP}-{n'_PP}`
Here ` n_(t_(2g))` is number of electron in ` t_(2g) ` orbitals ,` n_(e_g) ` is number of electrons in ` e_g` orbitals,`n_p` is number of electron pairs in the ligand field ,& `n'_p` is the number of electron pairs in the isotropic field
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Knowledge Check

  • The magnitude of crystal field stabilisation energy (CFSE or Delta_t ) in tetrahedral complexes is considerably less than in the octahedral field. Because

    A
    There are only 4 ligands instead of six. So the ligand field in only 2/3 the size, hence `Delta_t` is only 2/3 the size.
    B
    the direction of orbitals does not coincide with the direction of the ligands. This reduces the crystal field stabilisation energy `(Delta_t)` by further 2/3.
    C
    both (a) and (b) are correct
    D
    both (a) and (b) are wrong.

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    For the [CoF_(6)]^(3-) ion the mean pairing energy is found to be 21000cm^(-1) . The magnitude of Delta_(0) is 13000cm^(-1) . Calculate the crystal field stabilization energy for this complex ion corresponding to low spin and high spin states.

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