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Kinetics and mechanism of substitution of bis(tptz)iron(II) by 2,2′-bipyridine and 1,10-phenanthroline

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Abstract

The kinetics of substitution of Fe(tptz)2+2 by 2,2′-bipyridine and 1,10-phenanthroline have been investigated in acetate buffers in the 3.6–5.6 pH range employing stopped-flow spectrophotometry. These reactions are very fast and complete within 5 s. The rate of substitution is linearly dependent on [phen] and [bpy]2, and increases with the increase in pH. Suitable mechanisms have been proposed involving the unprotonated form of the entering ligand, viz. bipyridine/phenanthroline as the reactive species. The pKa values of bipyridine and phenanthroline, determined from the kinetic data, are in agreement with the literature values. It is concluded that the substitutions of iron(II)-diimine complexes also occur by an associative mechanism.

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Authors and Affiliations

  1. School of Chemistry, Andhra University, Visakhapatnam, 530 003, India

    Garimella Visweswara Rao, Yeleswarapu Sridhar, Pamidipati Gayatri Hela, Trilochan Padhi & Nageswara Rao Anipindi

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  1. Garimella Visweswara Rao
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  2. Yeleswarapu Sridhar
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  3. Pamidipati Gayatri Hela
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  4. Trilochan Padhi
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  5. Nageswara Rao Anipindi
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Visweswara Rao, G., Sridhar, Y., Hela, P.G. et al. Kinetics and mechanism of substitution of bis(tptz)iron(II) by 2,2′-bipyridine and 1,10-phenanthroline. Transition Metal Chemistry 24, 566–570 (1999). https://doi.org/10.1023/A:1006920728571

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