The stability constants of the complexes of 1,10-diaza-4,7,13,16-tetraoxacyclooctadecane-l ,I 0-bis(ma1onate) formed with alkaline-earths, lanthanides, zinc, cadmium and lead are larger for larger metal ions, which is manifested in unusually high Sr2+/Ca*+ and Pb2+/Zn2+ selectivities in aqueous solution.
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