Abstract
A new family of pyrimidyl-enolate-based bisboron complexes (DB1-3) with intense fluorescence in both solution and solid-state has been developed. Although these complexes have a propeller-shaped structure, DB1-3 showed intense fluorescence in the diluted solution because of the efficient steric hindrance induced by phenyl rings. As a result, a very weak AIE effect was observed in the tetrahydrofuran-water binary solvents. Moreover, these complexes displayed highly efficient solid-state fluorescence with high quantum yields ranging from 32 to 55%. The relationship between the excellent photophysical properties of these complexes and their propeller-shaped structure was rationalized by single-crystal X-ray analysis. Utilizing the advantages of highly emissive in both solution and solid-state and good hydrophobicity, DB1-3 can target lipid droplets in living HeLa cells, which may be used as novel scaffolds for developing fluorescent LDs probes for investigating the related pathological processes.
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