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The stability constants for the Ni(II) complexes formed with eight macrocyclic tetrathiaethers are found to be 109 smaller than the corresponding Cu(II) complexes in acetonitrile at 25 °C. The selectivity ratio for Cu(II) over Ni(II) appears to be at least as large as aqueous solution. This is the largest selectivity ever obtained by any class of chelating agents for Cu(II) over Ni(II).
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Kulatilleke et al. (1999) studied this question.
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