Stability of Chelate Complexes

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ATTENTION has recently been directed to parallelisms in the order of the stability constants of the complexes formed by bivalent metal ions with different ligands1,2. We have investigated the stability constants of the complexes formed by metal ions with β,β',β"-triaminotriethylamine, N(CH2CH2NH2)3, (tren), which can provide four ligand atoms for a given ion, as previously shown by Mann and Pope3, who prepared complexes of this tetramine with several bivalent ions. The stability constants have been evaluated by combining the acidity constants of the acid (trenH3)3+ with the equilibrium constants of the reaction :

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    Irving, H., and Williams, R. J. P., Nature, 162, 746 (1948).

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    Calvin, M., and Melchior, N. C., J. Amer. Chem. Soc., 70, 3270 (1948).

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    Mann, F. G., and Pope, W. J., J. Chem. Soc., 482 (1926).

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    Bjerrum, J., and co-workers, thesis, Copenhagen, 1941; Kgl. Danske Videnskab. Selskab. Math. fys. Medd., 22, Nr. 7, 3 (1945); Acta Chem. Scand., 2, 297 (1948).

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    Mills, W. H., and Quibell, T. H. H., J. Chem. Soc., 839 (1935).

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ACKERMANN, H., PRUE, J. & SCHWARZENBACH, G. Stability of Chelate Complexes. Nature 163, 723–724 (1949) doi:10.1038/163723b0

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