Abstract
The kinetics of reaction of Pt(terpy)Cl+ with various ligands were measured. The complex is approximately 103–104 times more reactive than its dien analogue. The relative reactivity order observed for the ligands studied from that expected on the basis of their n°Pt values. These data are discussed in the light of the ability of aromatic ligands to enter into π-bonding with the metal, and of the biphilic properties of the incoming groups involved. Although each ligand obeys the usual two-term rate law common for square-planar substitution, kobs = k1 + k2[Y], the value of k1 is not common to all the incoming groups. A mechanism is proposed to account for this departure from “classical” behaviour.
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