Feel free to correct me, but I don't think diatomic Cl would cause FB amines to be ionized.
I think that passing Cl2 through this solution (solvent?), and forgive my regression to high school O chem, would do next to nothing but make you unhappy that your neighbors came over complaining that their house has suddenly been filled with nasty smelling pool fumes coming from that yellow gas emitting suspicious tube that is hanging out of your window.
On the other hand, if you were to mix this gassing with FeCl3, then you could possibly suspect that there would be some type of aromatic subsitution. Sorry, but this empty 40oz next to me provides that I do not know which position it would most likely react. I am only familiar with this rxn in a liquid reactant, so I don't know which solvent would be best (sorry). May we hear what might bee the sought result?