In organic compounds, room temperature phosphorescence (RTP) is a rare, yet highly desirable, property that is important for a wide variety of applications, including tissue imaging, anticounterfeiting technologies, photodynamic therapy, and organic light-emitting devices. While most organic RTP molecules rely on heavy atoms or carbonyl functional groups to accelerate singlet-to-triplet intersystem crossing, in the past few years there have been several reports of RTP induced by boroncontaining functional groups. This minireview covers the recent literature on RTP of crystalline boroorganic compounds and analyzes the connections between molecular structure, intermolecular interactions, and the resulting phosphorescence.
This study describes the synthesis, structure, and photophysical properties of an ew luminescent polyaromatic boronic acid scaffold, diazaboryl-naphthyl-ketones (DNKs). These stable compounds display extremely bright fluorescence, aggregation-inducede mission, positive solvatochromism,a nd solid-statef luorescence. DFT calculations and X-ray crystallographic study revealed notable electronic and structurald ifferences between these compounds and the parentd iaminonaphthalene (DAN) adducts. Acylation of the DAN system causes alocalization of both HOMO and LUMO onto the DNK unit, which validates the negligible influenceo ft he B-aryl substituent. The LUMO energy is lowered, and its shape significantly altered.P hotophysical data in solution and the solids tate revealedb lue-shifted, narrowed, and intense emissions for DNKs (up to 89 %q uantum yield). The potentialu tility of the fluorogenic DNK system was demonstrated with a proof-of-concept for the determination of trace boronic acid contaminants in solid samples, down to one-ppm level, using HPLC with fluorescence detection. This methodc ould be useful in pharmaceutical development for the quantitationo fd ifficult-to-detect and potentially mutagenic residual boronic acid from late cross-coupling reactions in drug syntheses.
emission (AIE), and thermally activated delayed fluorescence (TADF). This Review covers the literature until the end of 2020 on the inherent luminescence of tricoordinate arylboronates, grouped into azaborolines (ArÀ BNY), boronic acids and esters (ArÀ BO 2 ), with a particular focus on the impact of the boron atom on photophysical properties.
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