Synthesis and Fluorescent Properties of Chiral Polymer Complexes Incorporating Bipyridine and Eu(III) or Gd(III)

Abstract

AbstractChiral polymer P‐1 was synthesized by the polymerization of (R)‐5,5′‐dibromo‐6,6'‐di(4‐trifluoromethyl‐ phenyl)‐2,2′‐bisoctoxy‐1,1'‐binaphthyl (R‐M‐1) with 5,5′‐divinyl‐2,2′‐bipyridine (M‐2) via Pd‐catalyzed Heck reaction. The polymer complexes P‐2 and P‐3 could be obtained by the bipyridyl coordination of P‐1 with Eu(TTA)3·2H2O and Gd(TTA)3·2H2O (TTA−=1‐(2‐thenoyl)‐3,3,3‐trifluoroacetonate). The chiral polymer P‐1 shows strong blue fluorescence due to the extended ‐electronic structure between the chiral repeating unit (R)‐6,6'‐di(4‐trifluoromethyl‐phenyl)‐2,2′‐bisoctoxy‐1,1'‐binaphthyl and the conjugated linker 2,2′‐bipyridyl (bpy) group via vinylene bridge. The Eu(III)‐containing polymer complex P‐2 can not only emit the polymer fluorescence, but also have the characteristic fluorescence of Eu(III) (5D0→7F2) under different exciting wavelengths. The Gd(III)‐containing polymer complex P‐3 only emits the polymer fluorescence. Based on the fluorescent properties of the polymer and RE(III)‐containing polymer complexes, it can be concluded that the chiral polymer does not transfer energy to Eu(III) or Gd(III) complex moiety but emits its own fluorescence.