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The thermodynamic stability of the copper+ethylenediamine complex is determined in montmorillonite and a macroreticular sulphonic acid resin using ion exchange data and the complex formation function. Both methods are in excellent agreement and correspond to an increase in the overall stability constant of 103 for montmorillonite and 101·3 for the resin. The stepwise formation constants text-decoration:overlineK1text-decoration:overlineK2 of the ion exchanged complex are 1011·6 and 1011·5 for montmorillonite and 1011·65 and 109·7 for the resin, as compared with values of 1010·7 and 109·3 for the bulk solution. Some tentative interpretation is offered in terms of a decreased ligand solvation in the ion exchanger.
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Maes et al. (1978) studied this question.
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