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You use bis and tris when the ligand already has a bi or prefix in front of it. For example, you would say bisethylenediammine as en already has a "di" in it. You also use bis and tris when the ligand is polydentate like EDTA and oxalate.
The book on page 723 explains with detail when to use it but the simple matter of it, it that you use it when there is already prefix on the molecule name such as Di converts to Bi and etc, but I would take a glance at the reference number I gave you.
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