Towards promising oxoanion extractants: azacages and open-chain counterparts

David Farrell; Karsten Gloe; Kerstin Gloe; Gudrun Goretzki; Vickie McKee; Jane Nelson; Mark Nieuwenhuyzen; Ibolya Pál; Holger Stephan; Raewyn M. Town; Kathrin Wichmann

doi:10.1039/B210289G

Towards promising oxoanion extractants: azacages and open-chain counterparts†

David Farrell,^a Karsten Gloe,^b Kerstin Gloe,^b Gudrun Goretzki,^b Vickie McKee,^c Jane Nelson,^d Mark Nieuwenhuyzen,^a Ibolya Pál,^a Holger Stephan,^e Raewyn M. Town^a and Kathrin Wichmann^b

Author affiliations

^a School of Chemistry, Queen's University of Belfast, Belfast, UK

^b Institut für Anorganische Chemie, Technische Universität Dresden, 01062 Dresden, Germany

^c Chemistry Department, Loughborough University, Loughborough, Leics, UK

^d School of Biomedical Sciences, University of Ulster, Coleraine, UK

^e Institut für Bioanorganische und Radiopharmazeutische Chemie, Forschungszentrum Rossendorf, 01314 Dresden, Germany

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.

This article is part of the themed collection: Celebrating the 150th anniversary of the German Chemical Society

Dalton Transactions

Towards promising oxoanion extractants: azacages and open-chain counterparts†

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Towards promising oxoanion extractants: azacages and open-chain counterparts

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