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Issue 10, 2003
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Towards promising oxoanion extractants: azacages and open-chain counterparts

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Abstract

The efficiency of a series of amino-azacryptands for encapsulation and extraction of the oxoanions pertechnetate and perrhenate from aqueous solution is investigated and compared with that of their open-chain counterparts. The aqueous formation constants for oxoanion association with the cryptands were determined by pH potentiometry and/or NMR, and X-ray analysis of single crystals provides evidence for encapsulation. The extractabilities could not be explained solely on the basis of ligand lipophilicity; the level of protonation also plays an important role.

Graphical abstract: Towards promising oxoanion extractants: azacages and open-chain counterparts

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Publication details

The article was received on 21 Oct 2002, accepted on 07 Jan 2003 and first published on 23 Apr 2003


Article type: Paper
DOI: 10.1039/B210289G
Citation: Dalton Trans., 2003,0, 1961-1968
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    Towards promising oxoanion extractants: azacages and open-chain counterparts

    D. Farrell, K. Gloe, K. Gloe, G. Goretzki, V. McKee, J. Nelson, M. Nieuwenhuyzen, I. Pál, H. Stephan, R. M. Town and K. Wichmann, Dalton Trans., 2003, 0, 1961
    DOI: 10.1039/B210289G

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