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Metal-Cation-Based Anion Exchange Membranes
Here we present the first metal-cation-based anion exchange
membranes
(AEMs), which were synthesized by copolymerization and cross-linking
of a norbornene monomer functionalized with a water-soluble bisÂ(terpyridine)ÂrutheniumÂ(II)
complex and dicyclopentadiene. Each ruthenium complex has two associated
counteranions, unlike most ammonium- and phosphonium-based membranes
with single cation–anion pairs. The resulting AEMs show anion
conductivities and mechanical properties comparable to those of traditional
quaternary-ammonium-based AEMs as well as good alkaline stability
and methanol tolerance. These results suggest that metal-cation-based
polymers hold promise as a new class of materials for anion-conducting
applications