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Mechanistic studies on the reactions of pentaaquahydroxochromium(III) ion with 2,2′-bipyridine and 1, 10-phenanthroline

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Summary

Kinetic studies in water-ethanol solution on the replacement of the aqua-ligands in [Cr(H2O)5(OH)]2+ by 2,2′-bipyridine (bipy) and 1, 10-phenanthroline (phen) have been made spectrophotometrically. In both the cases the reaction proceeds by a path which is first order with respect to the base. The reaction is catalysed by NO −3 and the rate increases with the increase of pH. We propose the rate law

$$k_{obs} = k_1 k_2 \left[ L \right]/\left( {k_{---1} + k_2 \left[ L \right]} \right)$$

where k1 is the water dissociation rate of the substrate complex, k−1 is the aquation and k2 is the ligand capturing rate of the pentacoordinate intermediate [Cr(H2O)4(OH)]2+. Experimental results are consistent with a dissociative mechanism. Variation of dielectric constant of the medium was used to verify the mechanistic conclusion in the reaction with bipy.

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Authors and Affiliations

  1. Chemistry Department, University of Burdwan, 713104, Burdwan, India

    Hari Gopal Mitra Mustofy & Gouri Sankar De

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  1. Hari Gopal Mitra Mustofy
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  2. Gouri Sankar De
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Mustofy, H.G.M., De, G.S. Mechanistic studies on the reactions of pentaaquahydroxochromium(III) ion with 2,2′-bipyridine and 1, 10-phenanthroline. Transition Met Chem 13, 196–200 (1988). https://doi.org/10.1007/BF01171324

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