Abstract
A family of iminoboronates was prepared through a one-pot multicomponent reaction, starting from boronic acid, anthranilic acid, and different salicylaldehydes. Their synthesis was straightforward and the complexes were obtained in good to excellent yields. Their photophysical properties were assessed in a diluted solution, and the complexes proved to be faintly luminescent. These chelates demonstrated remarkable Aggregation-Induced Emission Enhancement, which was rationalized using crystal structures.
Highlights
Boron complexes based on N and O donor ligands have been widely studied due to their ease of preparation and versatility [1]
In terms of luminescent properties, boron complexes are dominated by boron dipyrromethenes (BODIPYs) [2], but recently, boron diketonates [3,4,5] and ketoiminates [6] have emerged as promising alternatives
Boron complexes usually suffer a quenching of their emission upon aggregation, which limits their use in luminescent materials
Summary
Boron complexes based on N and O donor ligands have been widely studied due to their ease of preparation and versatility [1]. Boron complexes usually suffer a quenching of their emission upon aggregation, which limits their use in luminescent materials They can present the opposite behavior, aggregation-induced emission enhancement (AIEE) [10], when adequately substituted with aromatic rotating groups [11,12,13,14,15]. In these cases, the emission intensity increases upon aggregation, due to the restriction of molecular motions and absence of excimer formations. The use of a tridentate ligand is less explored and mainly relies on the use of boronic acid or ester as precursor of the complex
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