Rare‐earth‐metal‐containing polymers. 5. Synthesis, characterization, and fluorescence properties of Eu3+‐polymer complexes containing carboxylbenzoyl and carboxylnaphthoyl ligands

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Abstract
Partially 2‐carboxylbenzoyl (1) and 3‐carboxyl‐2‐naphthoyl (2) substituted polystyrene were prepared by the Friedel‐Crafts reaction of polystyrene with corresponding dicarboxylic anhydrides. Europium (III) salts of (1) and (2) and the copolymer of 4‐vinylbenzoyl 2′‐carboxylbenzoate‐di(2‐benzoyl benzoate) and styrene (5) were prepared. Polymer (5) was prepared by the copolymerization of the Eu3+ salt of 4‐vinylbenzoyl 2′‐benzoate and 2‐benzoylbenzoate (ratio 1:2) with styrene. The fluorescence emission intensity was measured on fine powder samples. The intensity of (5) increased linearly as the Eu content increased. However, for the 1 and 2 systems the intensity reached a maximum at a Eu content as small as 0.5 wt% and remained constant when further increases were made. This phenomenon was accounted for by steric hindrance and a decrease in the freedom of bond rotation, which prevent the formation of multiple coordination linkages between Eu3+ and the benzoate groups.

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