Crystal Field Theory Worksheet

 

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  1. What is the crystal field model?

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  2. Show the interaction between the d-orbital and the negative point charge ligands

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  3. Based on the diagrams above, would all of the d orbitals have the same energy?  If not which would be higher energy?

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  4. The phenomena of d orbital splitting can happen two ways

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    1.  
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  5. What affects the type of splitting that will happen?

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    1. General Ligand Ordering

     

     

  6. The _________ the charge on the metal the stronger the splitting.

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  7. The Crystal Field Method can be used to explain the

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    1.  
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  8. How does this model explain color?

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  9. How can we determine the color we will see? 

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  10. What is the d-orbital splitting for

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    1. Tetrahedral Geometry
    2. Square Planar
    3. Linear

     

     

  11. How does the electronegativity of a ligand affect the d orbital splitting?

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  12. Compounds of copper(II) are generally colored, but compounds of copper(I) are not.  Explain.  Would you expect Cd(NH3)4Cl2 to be colored?

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  13. Consider the complex ions Co(NH­3)63+, Co(CN)63-, and CoF63-/  The wavelengths of absorbed electromagnetic radiation for these compounds are (in no specific order) 770 nm, 440 nm, and 290 nm.  Match the complex ion to the wavelength of absorbed electromagnetic radiation.

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  14. How many unpaired electrons are in the following complex ions? 

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    1. Ru(NH3)62+ (low spin case)
    2. Ni(H2O)62+
    3. V(en)33+

     

     

  15. Draw the d-orbital splitting for the octahedral complex ions in each of the following.

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    1. Fe2+ (high and low spin)
    2. Ni2+
    3. Zn2+

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