Add time:07/31/2019         Source:sciencedirect.com

The reaction AuCl−4 + am → AuCl(am)2+ + 3Cl− where am = 1,1,4-trimethyldiethylenetriamine in aqueous acid medium obeys the rate law where k and k′ are constants. When am= 1,1,7,7-tetramethyldiethylenetriamine or 1,1,4,7,7-pentamethyldiethylenetriamine the rate law changes to where k″ and k‴ are constants. Ion pair formation between the latter protonated amines and chloride ions not only explains the change in the rate laws mentioned above but also the observation of an “extra” chloride ion term in the rate laws for the displacement of chelated amines by Cl− from four-coordinated d8 complexes.

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