24. Transition Metals and Coordination Compounds

For which of the following complexes, the energies of the dx2−y2 and dz2 orbitals will be lower than the other three d orbitals?

Complete the exercises below.

Draw the crystal-field energy-level diagrams and show the placement of electrons for each of the following complexes:

d. [NiCl₄]²⁻ (tetrahedral),

Complete the exercises below.

Carbon monoxide, CO, is an important ligand in coordination chemistry. When CO is reacted with nickel metal, the product is [Ni(CO)₄] which is a toxic, pale yellow liquid.

a. What is the oxidation number for nickel in this compound?

b. Given that [Ni(CO)₄] is a diamagnetic molecule with a tetrahedral geometry, what is the electron configuration of nickel in this compound?

c. Write the name for  [Ni(CO)₄] using the nomenclature rules for coordination compounds.

For each of the following complexes, draw a crystal field energy-level diagram, assign the electrons to orbitals, and predict the number of unpaired electrons.

(b) [MnCl4]2- (tetrahedral)

For each of the following complexes, draw a crystal field energy-level diagram, assign the electrons to orbitals, and predict the number of unpaired electrons.

(c) [Co(NCS)4]2- (tetrahedral)