A new high-capacity metal ion-complexing gel containing cyclen ligands

We describe a new polymeric hydrogel that binds divalent metal ions with large binding constants and capacity. A new acrylate monomer with the pendant cyclen, tri-tert-butyl-10-(2-(2-(2-(methacryboyloxy) ethoxy)ethoxy)-2-oxoethyl)-1,4,7,10-tetraazacycEododecane-1,4,7-tricarboxylate, was polymerised by RAFT to a roughly spherical 5-9 unit ollgomer bearing a carboxylate-functionahsed end-group. This was de-protected and coupled to an amine dendrimer then crosslinked into a nylon-type hydrogel capable of absorbing more than 10 wt% copper ions.