Abstract
The kinetics of the acid-catalyzed dissociation of tris(pyridine-2-acetaldehyde-N-Methylimine)iron(II) were investigated photometrically in 2 M HClLiCl mixtures, ranging from 2 × 10 −5 to 2 M in HCl. The rate of dissociation was shown to be first order in complex. Experimental rate data are in agreement with a mechanism previously suggested for related iron-diimine complexes with unsymmetric ligands. The mechanism consists of two simultaneous reaction paths differing by the sequence in which the bonds between the metal atom and the two different moieties of the ligand are broken. Values for the rate constants and activation parameters of the rate-determininig step were estimated and compared with the values reported for related iron-diimine complexes. The influence of the methyl group, present in the chromophore, on the bonding ability of the ligand is discussed on the basis of these values.
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