Picture of athlete cycling

Open Access research with a real impact on health...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the Physical Activity for Health Group based within the School of Psychological Sciences & Health. Research here seeks to better understand how and why physical activity improves health, gain a better understanding of the amount, intensity, and type of physical activity needed for health benefits, and evaluate the effect of interventions to promote physical activity.

Explore open research content by Physical Activity for Health...

Metal-ion extraction by immobilised aza crown ethers

van de Water, L.G.A. and Driessen, W.L. and Reedijk, J. and Sherrington, D.C. (2002) Metal-ion extraction by immobilised aza crown ethers. European Journal of Inorganic Chemistry, 2002 (1). pp. 221-229. ISSN 1434-1948

Full text not available in this repository. Request a copy from the Strathclyde author


The immobilisation of [15]aneNO(4), [15]aneN(2)O(3), and [18]aneN(2)O(4) onto the oxirane and thiirane containing copolymers p(GMA-O) and p(GMA-S) resulted in six aza crown ether containing polymers with interesting metal-ion affinities, The pendent hydroxy or thiol groups, originating from the polymeric backbones, appeared to play an important role in the observed metal-ion affinities. The metal-ion affinity of p(GMA-O)-[15]aneN(2)O(3) for a range of cations was found to decrease with decreasing ionic radius: Ag+ > Pb2+ > Cd2+ > Cu2+. The thiol-containing analogue of this polymer, p(GMA-S)-[15]aneN(2)O(3), showed a reversed Cd2+/Cu2+ selectivity. This illustrates the capability of pendent hydroxy groups to seriously reduce the stability of complexes of small cations compared to those of large cations. All the modified oxirane resins tested were found to be Ag+-selective in the presence of a range Of divalent (heavy) transition-metal ions. The difference in ring size between [15]aneN(2)O(3) and [18]aneN(2)O(4) was found to have a significant effect on the uptake values of Cu2+ and Zn2+, as these ions are too small to fit into the ligand cavity of [18]aneN(2)O(4). The uptake values for the larger Ag+ and Pb2+ were found to be similar for both resins, Loaded resins were successfully regenerated (with an efficiency of 99%) by treatment with 2.0 m acid solutions (Pb2+ and Cd2+) or with a 3.35 m NH3 + 2.0 m NH4NO3 solution (Ag+).