Abstract
Butyl methacrylate copolymers with 3-(methacryloylamino)-2-naphthoic acid (MANA) carrying alkali counterions exhibit in highly dilute dioxane or toluene solution two emission bands, one (a) with a maximum at 405-415 nm, the other (β) with a maximum at 490-500 nm. The results suggest that the α emission is due to associated and the β emission to unassociated ion pairs. This interpretation is supported by solution viscosity data, where an increasing viscosity with a counterion change in the order Cs + < Na + < Li + is the same as the order of increasing intensity of the α emission
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