Abstract Copolymers bearing azacrown ether and anthracene moieties were synthesized using methacrylates of N-2-ethyl-azacrown ether or 9-hydroxymethylanthracene. Their fluorescence behaviors in the presence of alkali metal ions were measured in THF: H 2 O= 10: 1 solution. Maximum fluorescence intensities for copolymers bearing aza-12-crown-4, 15- crown-5 and 18-crown-6 were observed for with Na+, K+ and K+, respectively. The largest ...