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Kinetics and mechanisms of substitution of the axial and equatorial ligands in an iron(II) macrocyclic heme model complex

✍ Scribed by Henrique E. Tomam; Fabio S. Nunes

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
374 KB
Volume
25
Category
Article
ISSN
0538-8066

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✦ Synopsis

The complex [Fe(imox) (Nmim)~], where imox is a planar bis(iminooxime) macrocyclic ligand and Nmim = N-methyl imidazole, undergoes substitution reactions in the presence of 2,2'bipyridine (bipy), leading to a series of intermediate mixed complexes. The forward and reverse rate constants for the substitution of the Nmim ligand by water are kl = 0.23 s-' and k-1 = 62 M-ls-', respectively. The binding of a bipy to the [Fe(imox)(Nmim) (H20)I' complex proceeds according to k2 = 4.7 X M-' s-' and k-2 = 3.6 X s-', yielding [Fe(imox) (bipy) (Nmim)]', which eliminates Nmim according to k3 = 1.6 X s-'. Further substitution in the [Fe(imox) (bipy)]' complex with bipy takes place very slowly leading to the IFe(imox) (bipy)~]' and [Fe(bipy)3J2' complexes. 0

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