A π-Conjugated System with Flexibility and Rigidity that Shows Environment-Dependent RGB Luminescence

C. Yuan, S. Saito, C. Camacho, S. Irle, I. Hisaki, S. Yamaguchi
J. Am. Chem. Soc., 2013, 135 (24), pp 8842–8845
DOI: 10.1021/ja404198h


We have designed and synthesized a π-conjugated system that consists of a flexible and nonplanar π joint and two emissive rigid and planar wings. This molecular system exhibits respectively red, green, and blue (RGB) emission from a single-component luminophore in different environments, namely in polymer matrix, in solution, and in crystals. The flexible unit gives rise to a dynamic conformational change in the excited state from a nonplanar V-shaped structure to a planar structure, leading to a dual fluorescence of blue and green colors. The rigid and planar moieties favor the formation of a two-fold π-stacked array of the V-shaped molecules in the crystalline state, which produces a red excimer-like emission. These RGB emissions are attained without changing the excitation energy.

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