I have a 3-week lab experiment in my sophomore inorganic course that I call Project Werner, heavily adapted from Angelici's text, in which students first make their choice of 4 cobalt complexes: [Co(NH₃)₆]Cl₃, [Co(NH₃)₅Cl]Cl₂, [Co(NH₃)₄(CO₃]NO₃, or [Co(en)₃]Cl₃.  In the second week, everyone carries out ligand substitution of [Co(NH₃)₅Cl]Cl₂ to prepare the two linkage isomers of [Co(NH₃)₅(NO₂)]Cl