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- W2896523875 abstract "The synthesis and optical characterization of 9-(2,6-bis(methoxymethyl)phenyl) borafluorene (BMMP-BF) are reported. NMR spectroscopic data and single-crystal X-ray diffraction data of BMMP-BF show intramolecular chelation by the 2,6-bis(methoxymethyl)phenyl moiety via a boron–oxygen dative bond. The optical spectra of BMMP-BF are unusual in that absorption is entirely in the UV region (λmax = 284 nm), yet fluorescence occurs at 536 nm. This equates to a Stokes shift of 2.05 eV (16 500 cm–1) and is among the highest Stokes shifts ever reported for a small molecule. Density functional theory (DFT) calculations show that the boron–oxygen dative bond in BMMP-BF is ruptured in the excited state and that emission occurs from a trigonal planar boron geometry. This bond cleavage and the concurrent planarization of the boron center are responsible for the high Stokes shift. Two borafluorenes related to BMMP-BF were also examined: 9-(2,6-bis((methylthio)methyl)phenyl) borafluorene (BMTMP-BF) and 9-(2,6-bis(tert-but..." @default.
- W2896523875 created "2018-10-26" @default.
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- W2896523875 date "2018-10-10" @default.
- W2896523875 modified "2023-09-24" @default.
- W2896523875 title "Boranes with Ultra-High Stokes Shift Fluorescence" @default.
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- W2896523875 doi "https://doi.org/10.1021/acs.organomet.8b00460" @default.
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