#chelate effect

[whats-in-a-sentence]

Therefore, there is a significant probability that the 'dangling' donor atom can reattach to the metal ion before the other end of the ligand detaches (figure 13.23); from this, it is apparent that it should be more difficult to lose a bidentate ligand than a monodentate ligand.

"Chemistry" 2e - Blackman, A., Bottle, S., Schmid, S., Mocerino, M., Wille, U.