New polymers containing BF2-benzoylacetonate groups. Synthesis, luminescence, excimer and exciplex formation

• Published in: Journal of luminescence Vol. 185; pp. 23 - 33
• Main Authors: Fedorenko, Elena V., Mirochnik, Anatolii G., Beloliptsev, Anton Yu
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-05-2017
• Subjects: Boron difluoride beta-diketonate; Excimer; Exciplex; Functionalization of polystyrene; Luminescence; Exciplex; Functionalization of polystyrene; Excimer; Boron difluoride beta-diketonate; Luminescence
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2017.01.002

In the present study, a new synthetic method for the functionalization of polystyrene (PS) and (styrene-methyl methacrylate) copolymer has been developed. Using the new method, polymers containing BF2-benzoylacetonate groups have been obtained through double acylation by acetic anhydride with boron trifluoride. Luminescence of the produced polymers in solutions and films has been studied. Quantum yields of polymer solution luminescence are significantly higher than those of the low-molecular-weight analog – boron difluoride benzoylacetonate. For the polymer, in which styrene fragments are separated by methyl methacrylate groups, at low concentrations of the polymer in solution one observes the monomer luminescence of BF2-benzoylacetonate groups, while at high concentrations – the excimer luminescence. In case of PS-based polymers, in which BF2-benzoylacetonate groups and phenyl rings are not separated, in diluted solutions one observes the fluorescence of the intramolecular exciplexes, while at the concentration increase – the luminescence of intermolecular exciplexes. The ability of excimer formation is responsible for the increased photostability of the produced polymers.
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•Polymers containing BF2-benzoylacetonate groups have been synthesized.•Luminescence of the produced polymers in solutions and films has been studied.•Formation of excimers and exciplexes in solution has been revealed.•Formation of excimers in films increases their photostability.