Chapter 21, Problem 82RQ

Referring to the complexes in Problems 21.80 and 21.81 would the color of ${\left[\text{Co}{A}_6\right]}^{2+}$ more likely be red or blue?

A complex ${\left[\text{Co}{A}_6\right]}^{3+}$

is red. The complex ${\left[\text{Co}{B}_6\right]}^{3+}$ is green. Which ligand. A or B, produces the larger crystal field splitting, $\Delta$? Explain your answer.

Referring to the two ligands, A and B, described in Problem 21.80, which complex would be expected to be more easily oxidized ${\left[\text{Co}{A}_6\right]}^{2+}$ or ${\left[\text{Co}{B}_6\right]}^{2+}$? Explain your answer.