Chalcogen-Influenced Benzochalcogenazolo-Based N,O-Coordinated Difluoroboron Complexes: From Lasing Dyes to Room-Temperature-Phosphorescence Emitters
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Chalcogen-Influenced Benzochalcogenazolo-Based N,O-Coordinated Difluoroboron Complexes From Lasing Dyes to Room-Temperature-Phosphorescence Emitters.pdf (6.02 MB)
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0000-0002-8537-4196 Date
2025
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American Chemical Society
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Abstract
Four N,O-coordinated benzochalcogenazolo-based boron difluoride complexes were designed, synthesized, and spectroscopically investigated in solutions, crystalline state, and dye-doped poly(methyl methacrylate) films. The single crystal analysis revealed that oxadiazaborinine dyes adopt planar geometry with multiple intermolecular hydrogen-bonding interactions. The benzoxazole- and benzothiazole-containing dyes exhibit highly intensive photoluminescence in the crystalline state and when dispersed in the inert polymer, accompanied by high-rate constants of radiative deactivation (2.2 × 108 s–1 and 2.7 × 108 s–1, respectively). This results in their amplified spontaneous emission ability with very low thresholds of 11 and 4.7 μJ/cm2, respectively, and very narrow bandwidths with the values of full widths at half maxima of 10 and 6.3 nm. In stark contrast, the benzotellurium-containing analogue shows room temperature phosphorescence with a short phosphorescence lifetime of 9.4 μs, caused by the strong chalcogen heavy-atom effect.
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Inorg. Chem. 2025, 64, 28, 14704–14716 // https://doi.org/10.1021/acs.inorgchem.5c02557