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A chelating complex is when a ligand can bond to the same metal atom more than once, creating a sort of cage/ring around it. In 17.35, B is the only one that can form a chelating complex because it is the only one with the two NH2 molecules close enough to bond with a metal atom. The other two complexes have their two NH2 molecules too far apart to bond to the same molecule, they would only be able to bond one at a time to a metal atom, not together.
Chelating complexes are when the ligands form a ring that includes the central metal, and form with polydentate ligands. For 17.35, only isomer b can bind both amine groups to the same transition metal centers. A and c wouldn't work because the amine groups would have to bind to two different transition metals, which would not form a chelate.
How can you tell whether or not the ligand's lone pairs are close enough together to interact with the same metal? Is this something you just judge by eye based on the lewis structure/molecular geometry, or is there a rule?
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