Development of novel dyes showing strong fluorescence in the near infrared region both in solution and in the solid state.

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Novel fluorescent dyes, pyrazine-boron complex and thiazole-boron complexes, have been synthesized and their fluorescence properties were investigated. Synthesized pyrazine-boron complexes exhibited fluorescence in solution (F_max: 472-604 nm, Φ_f: 0.28-0.71) and in the solid state (F_max: 496-624 nm, Φ_f: 0.03-0.32). On the other hand, thiazole-BF2complexes exhibited higher Φ_f values in the solid state (Φ_f: 0.23-0.26) than in solution (Φ_f <=0.04); in other words, thiazole-BF2complexes have AIEE character.