Equilibria in complexes of N-heterocyclic molecules,part XXI. Kinetics of reaction of hydroxide with bis [2,4,6-tri (2-pyridyl)-1,3,5-triazine] iron (II) and ruthenium(II)

Summary The kinetics of reaction of HO^– with Ru(TPT)₂]²⁺ and Fe(TPT)₂]²⁺ have been studied in detail. The former participates in an equilibrium with HO^– yielding a pseudo-base by attack at the ligand and, at very high concentrations of HO^–, dissociates to yield pure TPT quantitatively. Fe(TPT)₂]²⁺ dissociates rapidly in basic solution, even at 273 K, however, Fe(TPT)(TPT · OH)]+ does in fact exist and the Fell and Ru^ll reactions are quite similar, although that of Fell is much faster. The implications of these findings for the dissociation of Fe(TPT)₂]²⁺ over a wide range of pH are discussed.Patt XX, ref. 1.