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Abstract: The synthesis of polymers with pre-organized metal ion binding sites for optimal binding of selected metal ions is reported. An acyclic N-vinylbenzyl substituted chelator, triethylenetetramine, is complexed with copper(II) ions and crosslinked with matrix monomer TRIM [2-ethyl-2-(hydroxymethyl) propane-1, 3-diol trimethacrylate] to form the polymer. W- visible spectra indicate that the coordination geometry of the monomeric metal-ligand complex is highly conserved in the polymer. Unlike macrocyclic ligands, the acyclic ligating molecules demonstrate flexibility in forming chelation rings that are specific to metal-ion size and geometry. The complexation step is used as a means to optimize the chelator conformation for copper ions. The resulting polymers, after removal of metal ions, show selectivity towards the templated metal ions. The small size of the metal ions facilitated their access to the templated sites embedded in the porous polymers. This scheme has the potential to become a generalized procedure for making metal ion selective polymers. (C) 2000 Elsevier Science B.V. All rights reserved