Stability constants for some divalent metal ion/crown ether complexes in methanol determined by polarography and conductometry

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Chen, L. and Bos, M. and Grootenhuis, P.D.J. and Christenhusz, A. and Hoogendam, E. and Reinhoudt, D.N. and Linden, W.E. van der (1987) Stability constants for some divalent metal ion/crown ether complexes in methanol determined by polarography and conductometry. Analytica Chimica Acta, 201 . pp. 117-125. ISSN 0003-2670

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Abstract:Stability constants in methanol at 25.0°C were evaluated for the complexes of the divalent cations Ca2+, Ni2+, Zn2+, Pb2+, Mg2+, Co2+ and Cu2+ with the macrocyclic polyethers 15-crown-5 (15C5), 18-crown-6 (18C6), dicyclohexyl-18-crown-6 (DC18C6) and dibenzo-24-crown-8 (DB24C8). The log K values of the 1:1 complexes were generally in the range 2.1–4.2, which is low in comparison to the values of the corresponding crown ether/alkali metal ion complexes. M2L complexes were observed for the systems Pb2+/18C6, Pb2+/DC18C6, Ca2+/DC18C6 and Cu2+/D18C6, whereas ML2 complexes were found for Ca2+/18C6 and Cu2+/18C6. Within the series of complexes studied, there was no clear relationship between cation diameter and hole size.
Item Type:Article
Copyright:© 1987 Elsevier Science
Link to this item:http://purl.utwente.nl/publications/69877
Official URL:http://dx.doi.org/10.1016/S0003-2670(00)85330-1
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