Synthesis and photophysical properties of halogenated derivatives of (dibenzoylmethanato)boron difluoride.

Author(s) Kononevich, Y.N.; Surin, N.M.; Sazhnikov, V.A.; Svidchenko, E.A.; Aristarkhov, V.M.; Safonov, A.A.; Bagaturyants, A.A.; Alfimov, M.V.; Muzafarov, A.M.
Journal Spectrochim Acta A Mol Biomol Spectrosc
Date Published 2017 Mar 15

A series of (dibenzoylmethanato)boron difluoride (BF2DBM) derivatives with a halogen atom in one of the phenyl rings at the para-position were synthesized and used to elucidate the effects of changing the attached halogen atom on the photophysical properties of BF2DBM. The room-temperature absorption and fluorescence maxima of fluoro-, chloro-, bromo- and iodo-substituted derivatives of BF2DBM in THF are red-shifted by about 2-10nm relative to the corresponding peaks of the parent BF2DBM. The fluorescence quantum yields of the halogenated BF2DBMs (except the iodinated derivative) are larger than that of the unsubstituted BF2DBM. All the synthesized compounds are able to form fluorescent exciplexes with benzene and toluene (emission maxima at λem=433 and 445nm, respectively). The conformational structure and electronic spectral properties of halogenated BF2DBMs have been modeled by DFT/TDDFT calculations at the PBE0/SVP level of theory. The structure and fluorescence spectra of exciplexes were calculated using the CIS method with empirical dispersion correction.

DOI 10.1016/j.saa.2016.12.025
ISSN 1873-3557
Citation Kononevich YN, Surin NM, Sazhnikov VA, Svidchenko EA, Aristarkhov VM, Safonov AA, et al. Synthesis and photophysical properties of halogenated derivatives of (dibenzoylmethanato)boron difluoride. Spectrochim Acta A Mol Biomol Spectrosc. 2017;175:177-184.

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