. Explain why octahedral coordination complexes withthree and eight d electrons on the central metal atom areparticularly stable. Under what circumstances would youexpect complexes with five or six d electrons on the central metal atom to be particularly stable?

Mn(acac)3 was found to have its ground state to 1st excited state absorption at 500 nm (Δo). The pairing energy for this complex is 28,000 cm-1 . Based on this information, draw the populated ground state d orbital diagram for this complex.

3. For each of the following complexes, identify whether it is a low or high spin complex (if appropri- ate) and give its magnetic properties. [Fe(NH,),]²* [Cr(CO),J²+ [VCIJ³-

Three complex ions of cobalt(III), [Co(CN),]?-, [Co(NH;),]*, and (CoF, absorb light at wavelengths of (in no particular order) 290 nm, 440 nm, and 770 nm. Match each complex ion to the appropriate wavelength absorbed. What color would you expect each solution to be?

Write out structure representations for all isomers of the following complexes: (b) [WBr4(NH3)(OH)]5-