Abstract:The target mono-BF 2 complex is weakly emissive in fluid solution because radiationless decay of the excitedsinglet state is promoted through an intramolecular N•••HÀ N hydrogen bond. The lack of mirror symmetry for this compound is attributed to vibronic effects, as reported previously for the bis-BF 2 complex (BOPHY). Red-shifted fluorescence is observed from single crystals, the emission quantum yield approaching 30 % with a fluorescence lifetime of 2 ns. The large Stokes shift of 5,700 cm À 1 helps minimiz… Show more
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