Chapter 10 Flashcards
1
Q
- How do p-orbitals and d-orbitals split in an octahedral crystal field?
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2
Q
- Compare the splitting of the d-orbitals in an octahedral and tetrahedral crystal field.
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3
Q
- Determine the number of unpaired electrons in weak and strong octahedral crystal fields of 3d 4 , 3d 5 , 3d 6 and 3d 7 configurations.
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4
Q
- Determine the ligand field stabilization energy (LFSE) for the following octahedral metal complexes (a) d 3 , (b) high-spin d 5 , (c) high-spin d 6 , (d) low-spin d 6 , (e) d 9 .
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5
Q
- What is the Jahn-Teller effect? Which 3d n configurations exhibit the Jahn-Teller effect?
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6
Q
- How can you explain that d 3 and d 8 ions strongly prefer an octahedral geometry over a tetrahedral one?
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7
Q
- Compare crystal-field theory and ligand-field theory.
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8
Q
- How does π bonding affects the splitting of d-orbitals in an octahedral symmetry?
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9
Q
- How do the d-orbitals split in square-planar complexes? Why do d 8 complexes in strong ligand fields tend to form square planar complexes?
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10
Q
- What is the spectrochemical series? Give an explanation of the spectrochemical series in terms of chemical bonding.
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11
Q
- Give the term symbols for an atom with the configurations (a) s 1 , (b) p 1 , (c) s 1p 1 , (d) p 1d 1 .
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12
Q
- Determine the number of microstates in a 3d 2 configuration.
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13
Q
- What is the ground term of the configurations (a) 3d 5 of Mn2+ and (b) 3d 3 of Cr3+?
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14
Q
- What are charge-transfer bands? What is the difference between LMCT and MLCT transitions? For what types of d-metal complexes these transitions will be observed? Which lanthanide ions show chargetransfer bands? How can charge-transfer bands be recognized in an optical absorption spectrum?
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15
Q
- Explain why the [Co(H2O)6] 2+ complex has a faint pink color, whereas the [CoCl4] 2 – complex has a deep blue color.
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16
Q
- Explain why upon addition of concentration HCl to an aqueous solution of CoCl2 and NiCl2, cobalt(II) forms the [CoCl4] 2 – complex, whereas nickel(II) remains in the [Ni(H2O)6] 2+ form.
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17
Q
- What factors determine the spin state of a d-metal complex? What are spin-crossover complexes?
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18
Q
- The optical absorption spectrum of [Co(NH3)6] 3+ has a very weak band in the red, two moderate intensity bands in the visible to nearUV, and a very intense band in the far-UV. How should these transitions be assigned?
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