Question

A 1 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 (418.5 nm, 1.440 A.U) 2 (773.5 nm, 0.517 A.U) 400 500 600 700 800 900 nm [NiCl4]2- disp The tetrahedral tetrachloronickelate(II) ion, [NiCl4]2–, spectrum is presented above. (the first value is ?max the second is A.U which stands for Absorbance Units). Another Nickel octahedral complex forms with an unknown strong field ligand. The ?max for this complex is 375 nm in the UV and 650 in the visible region of the spectrum. Answer the following: 1. Write out the electronic configuration for Ni+2. 2. Sketch the splitting of the d orbitals to the t2g and eg levels for the weak field tetrahedral [NiCl4]2– complex as well as the octahedral unknown strong field complex. 3. Which complex is low spin (diamagnetic) and which hi spin (paramagnetic)? 4. Calculate the energy or ? for 1 photon to be excited from the t2g level to the higher eg for the [NiCl4]2– complex in the UV and Vis as well as the unknown complex in the UV and Vis ( 4 calculations total). 5. The concentration of each complex is 0.05M. Calculate the E absorbed by 1 mL of solution (for each ligand) assuming each complex absorbs only 1 photon.

          A
1
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
(418.5 nm, 1.440 A.U)
2
(773.5 nm, 0.517 A.U)
400 500 600 700 800 900 nm
[NiCl4]2- disp
The tetrahedral tetrachloronickelate(II) ion, [NiCl4]2–, spectrum is presented above. (the first value is ?max the second is A.U which stands for Absorbance Units).
Another Nickel octahedral complex forms with an unknown strong field ligand. The ?max for this complex is 375 nm in the UV and 650 in the visible region of the spectrum.
Answer the following:
1. Write out the electronic configuration for Ni+2.
2. Sketch the splitting of the d orbitals to the t2g and eg levels for the weak field tetrahedral [NiCl4]2– complex as well as the octahedral unknown strong field complex.
3. Which complex is low spin (diamagnetic) and which hi spin (paramagnetic)?
4. Calculate the energy or ? for 1 photon to be excited from the t2g level to the higher eg for the [NiCl4]2– complex in the UV and Vis as well as the unknown complex in the UV and Vis ( 4 calculations total).
5. The concentration of each complex is 0.05M. Calculate the E absorbed by 1 mL of solution (for each ligand) assuming each complex absorbs only 1 photon.

A
1
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
(418.5 nm, 1.440 A.U)
2
(773.5 nm, 0.517 A.U)
400 500 600 700 800 900 nm
[NiCl4]2- disp
The tetrahedral tetrachloronickelate(II) ion, [NiCl4]2–, spectrum is presented above. (the first value is ?max the second is A.U which stands for Absorbance Units).
Another Nickel octahedral complex forms with an unknown strong field ligand. The ?max for this complex is 375 nm in the UV and 650 in the visible region of the spectrum.
Answer the following:
1. Write out the electronic configuration for Ni+2.
2. Sketch the splitting of the d orbitals to the t2g and eg levels for the weak field tetrahedral [NiCl4]2– complex as well as the octahedral unknown strong field complex.
3. Which complex is low spin (diamagnetic) and which hi spin (paramagnetic)?
4. Calculate the energy or ? for 1 photon to be excited from the t2g level to the higher eg for the [NiCl4]2– complex in the UV and Vis as well as the unknown complex in the UV and Vis ( 4 calculations total).
5. The concentration of each complex is 0.05M. Calculate the E absorbed by 1 mL of solution (for each ligand) assuming each complex absorbs only 1 photon.

Added by Raquel W.

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