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Acid-catalysed hydrolysis of cis-[Cr(C2O4)(AaraNH2)(OH2)(OSO2)]− (where AaraNH2 denotes methyl 3-amino-2,3-dideoxy-α,d-arabino-hexopyranoside)

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Abstract

The synthesised complex cis-[Cr(C2O4)(AaraNH2)(OH2)(OSO2)]− anion with SO 2−3 as a ligand in the inner coordination sphere, where AaraNH2 denotes methyl 3-amino-2,3-dideoxy-α-d-arabino-hexopyranoside, was hydrolysed in the presence of acid at H+ concentrations from 0.01 to 2.7 m (HClO4). The reaction kinetics was studied with the stopped-flow spectrophotometric (u.v.–vis.) technique at temperatures of 5, 10, 15, 18 and 20 °C. This hydrolysis turned out to be a single-step process. Determined for this reaction were the rate constant k 1 for the removal of SO2 from the coordination sphere of the cis-[Cr(C2O4)(AaraNH2)(OH2)(OSO2)]− ion and the constant pK 1 of the protonation of this species in the reaction preceding the hydrolysis. The final product of this reaction – a new complex of CrIII, cis-[Cr(C2O4)(AaraNH2)(OH2)2]+, was obtained. A mechanism for the acid hydrolysis reaction is put forward based on the analysis of the rate constants obtained.

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Authors and Affiliations

  1. Department of General and Inorganic Chemistry, University of Gdańsk, Sobieskiego 18/19, Gdańsk, 80-952, Poland

    D. Jacewicz, A. Chylewska, A. Dąbrowska & L. Chmurzyński

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  1. D. Jacewicz
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  2. A. Chylewska
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  3. A. Dąbrowska
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  4. L. Chmurzyński
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Correspondence to D. Jacewicz.

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Jacewicz, D., Chylewska, A., Dąbrowska, A. et al. Acid-catalysed hydrolysis of cis-[Cr(C2O4)(AaraNH2)(OH2)(OSO2)]− (where AaraNH2 denotes methyl 3-amino-2,3-dideoxy-α,d-arabino-hexopyranoside). Transition Met Chem 32, 1030–1034 (2007). https://doi.org/10.1007/s11243-007-0284-5

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  • DOI: https://doi.org/10.1007/s11243-007-0284-5

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