Non-covalent (iso)guanosine-based ionophores for alkali(ne earth) cations

Leeuwen van, Fijs W.B. and Davis, Jeffery T. and Verboom, Willem and Reinhoudt, David N. (2006) Non-covalent (iso)guanosine-based ionophores for alkali(ne earth) cations. Inorganica Chimica Acta, 359 (6). pp. 1779-1785. ISSN 0020-1693

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Abstract:	Different (iso)guanosine-based self-assembled ionophores give distinctly different results in extraction experiments with alkali(ne earth) cations. A lipophilic guanosine derivative gives good extraction results for K+, Rb+, Ca2+, Sr2+, and Ba2+ and in competition experiments it clearly favors the divalent Sr2+ (and Ba2+) cations. 1,3-Alternate calix[4]arene tetraguanosine hardly shows any improvement in the extraction percentages compared to its reference compound 1,3-alternate calix[4]arene tetraamide. This indicates that one G-quartet does not provide efficient cation complexation under these conditions. In the case of the lipophilic isoguanosine derivative there is a cation size dependent affinity for the monovalent cations (Cs+ Rb+ K+), but not for the divalent cations (Ca2+ > Ba2+ > Sr2+ > Mg2+). In competition experiments the isoguanosine derivative, unlike guanosine, does not discriminate between monovalent and divalent cations, giving an almost equal extraction of Cs+ and Ba2+.
Item Type:	Article
Copyright:	© 2005 Elsevier B.V
Faculty:	Science and Technology (TNW)
Research Group:	Molecular Nanofabrication (MNF)
Link to this item:	http://purl.utwente.nl/publications/74471
Official URL:	http://dx.doi.org/10.1016/j.ica.2005.06.047
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