For the [TeCl6]^3- and [Tc(NCS)6]^3-, the crystal field splitting energies are 16,500 cm^-1 and 31,000 cm^-1,...

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Question

For the [TeCl6]^3- and [Tc(NCS)6]^3-, the crystal field splitting energies are 16,500 cm^-1 and 31,000 cm^-1,...

For the [TeCl6]^3- and [Tc(NCS)6]^3-, the crystal field splitting energies are 16,500 cm^-1
and 31,000 cm^-1, respectively, while the electron-pairing energy (P) for the Tc^+3 ion is
21,000 cm^1-.

a. Write the d electronic structures of the two complexes:

[TeCl6]^3-

[Tc(NCS)6]^3-

b. Calculate the CFSE for these two complexes (in cm):

[TeCl6]^3-

[Tc(NCS)6]^3-

Show CFSE calculations.

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Answer 1

Answer #1

a. The d-electronic configuration of [TcCl₆]^3- = t_2g³e_g¹

Explanation: The chloride ligand (Cl^-) is a weak field ligand, as a result, the crystal field splitting is less, so the fourth electron occupies e_g level after the t_2g level is half-filled.

The d-electronic configuration of [Tc(NCS)₆]^3- = t_2g⁴e_g⁰

Explanation: The thiocyanate ligand (NCS^-) is a strong field ligand, as a result, the crystal field splitting is high, so the fourth electron pairs up in the t_2g level itself, after the t_2g level is half-filled.

b. CFSE for [TcCl₆]^3- = 3*(-0.4 _o) + 1*(0.6 _o) = -0.6 _o = -0.6*16500 cm^-1 = -9900 cm^-1

CFSE for [Tc(NCS)₆]^3- = 4*(-0.4 _o) + 1*(P) = -1.6 _o + P = -1.6*31000 cm^-1 + 21000 cm^-1 = -28600 cm^-1

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Answer 2

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For the [TeCl6]^3- and [Tc(NCS)6]^3-, the crystal field splitting energies are 16,500 cm^-1 and 31,000 cm^-1,...

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For the [TeCl6]^3- and [Tc(NCS)6]^3-, the crystal field splitting energies are 16,500 cm^-1 and 31,000 cm^-1,...

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Add Answer to: For the [TeCl6]^3- and [Tc(NCS)6]^3-, the crystal field splitting energies are 16,500 cm^-1 and 31,000 cm^-1,...

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For the [TeCl6]^3- and [Tc(NCS)6]^3-, the crystal field splitting energies are 16,500 cm^-1 and 31,000 cm^-1,...