The stability constants of the complexes of 1,10-diaza-4,7,13,16-tetraoxacyclooctadecane-1,10-bis(malonate) formed with alkaline-earths, lanthanides, zinc, cadmium and lead are larger for larger metal ions, which is manifested in unusually high Sr2+/Ca2+ and Pb2+/Zn2+ selectivities in aqueous solution.
E. Brücher, B. Györi, J. Emri, P. Solymosi, L. B. Sztanyik and L. Varga, J. Chem. Soc., Chem. Commun., 1993, 574 DOI: 10.1039/C39930000574
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