Cation and anion binding studies of a large N,O-donor macrocycle: Single ion extraction and synergistic enhancement


Cation and anion binding studies of a large N,O-donor macrocycle: Single ion extraction and synergistic enhancement

Wenzel, M.; Gloe, K.; Gloe, K.; Bernhard, G.; Clegg, J. K.; Ji, X.-K.; Lindoy, L. F.

Mixed N,O-donor macrocycles have been shown to result in interesting complexation properties towards both cations and anions (the latter on protonation of the macrocycle's nitrogen functions).[1-3]
In the present study the phase transfer properties of 1 toward selected transition metal ions and anions have been evaluated by liquid-liquid extraction studies under different pH conditions. The order of increasing extraction follows the Irving-Williams series Co(II) < Ni(II) < Cu(II) > Zn(II), while the anion extraction is contolled by the Hofmeister series. A synergistic enhancement of metal extraction was obtained on exploiting a dual host strategy [4] in which the tripodal thiourea host 2 was incorporated in the system. In this case atypical anti-Hofmeister behaviour was obtained in which significant metal extraction of chloride or sulfate was observed from solution.
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Leong and L.F. Lindoy, J. Chem. Soc. Dalton Trans., 1991, 627-637.
[2] H. Adams, N.A. Bailey, D.E. Fenton, I.G. Ford, S.J. Kitchen, M.G. Williams, P.A.
Tasker, A.J. Leong and L.F. Lindoy, J. Chem. Soc. Dalton Trans., 1991,1665-1674.
[3] L. Tušek-Božić, A. Višnjevac, E. Marotta, B. Kojić-Prodic, Polyhedron 24, 2005, 97–
111.
[4] K. Kavallieratos, R.A. Sachleben, G.J. Van Berkel and B.A. Moyer, Chem. Commun.,
2000, 187-188.

  • Contribution to proceedings
    ISMSC 2007, 2nd International Symposium on Macrocyclic and Supramolecular Chemistry, 24.-28.06.2007, Salice Therme (Pavia), Italy

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