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Investigation of the kinetics of exchange of water in Mn(Fe)-ethylenediamine-N,N′-disuccinic acid systems by nuclear magnetic relaxation

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Abstract

The number of water molecules in the complexes and the nature of their interaction with the central ions and with the active groups of the ligand were established by investigation of the kinetics of the exchange of water in Mn(Fe)-edds systems by nuclear magnetic relaxation. The Mn-edds·nH2O complex contains three molecules of water, one of which is bound to the manganese ion while the other two are bound to the carboxyl groups of the edds. In the Fe-edds·nH2O complex two water molecules are bound to the central ion and one to the carboxyl group of the edds. The mechanism of the exchange processes, which have intermolecular and intramolecular character, was established. The values of the kinetic parameters Ea, ΔH⋆ and ΔS⋆ indicate a preference for the SN2 mechanism of exchange. The denticity and the structure of the complexes vary with variation of temperature.

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Authors
  1. N. N. Tananaeva
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  2. V. V. Strashko
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  3. R. V. Tikhonova
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Additional information

Institute of General and Inorganic Chemistry, Academy of Sciences of the Ukrainian SSR, Kiev. Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 27, No. 4, pp. 506–512, July–August, 1991. Original article submitted July 10, 1987.

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Tananaeva, N.N., Strashko, V.V. & Tikhonova, R.V. Investigation of the kinetics of exchange of water in Mn(Fe)-ethylenediamine-N,N′-disuccinic acid systems by nuclear magnetic relaxation. Theor Exp Chem 27, 443–448 (1991). https://doi.org/10.1007/BF01372527

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  • DOI: https://doi.org/10.1007/BF01372527

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