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

L. Chen, M. Bos, P.D.J. Grootenhuis, A. Christenhusz, E. Hoogendam, David Reinhoudt, W.E. van der Linden

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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.
    Original languageEnglish
    Pages (from-to)117-125
    JournalAnalytica chimica acta
    Volume201
    DOIs
    Publication statusPublished - 1987

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