Novel, solid-state, highly fluorescent β-ketoiminate spiroborates with aggregation induced emission

• Novel benzothiazolyl-1,2-diaryl β-ketoiminate spiroborates were synthesized.
• The synthesized spiroborates shows intense fluorescence in the solid-state.
• These compounds exhibits aggregation induced emission activity.

Novel catechol and salicyl-spiroborates containing β-ketoiminate ligand showing keto-enol tautomerism were synthesized. The fluorescent properties of the synthesized spiroborates were investigated. These spiroborates showed intense fluorescence in the solid-state and weak fluorescence in solution. These spiroborates showed prominent aggregation induced emission activity because of restricted intramolecular rotations of the aryl rings. The salicyl spiroborates showed better fluorescence property than the corresponding catechol spiroborates. The structural, electronic and spectroscopic properties were evaluated by using density functional theory (DFT).

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