Fedorenko Elena V, Тretyakova Galina O, Mirochnik Anatolii G, Beloliptsev Anton Yu, Svistunova Irina V, Sazhnikov Viacheslav A, Atabekyan Levon S
Institute of Chemistry, Far Eastern Branch of the Russian Academy of Sciences, 159, Prosp., 100-letiya Vladivostoka, Vladivostok, Russian Federation, 690022.
Far Eastern Federal University, 8 Sukhanova Str, Vladivostok, Russian Federation, 690600.
J Fluoresc. 2016 Sep;26(5):1839-47. doi: 10.1007/s10895-016-1876-2. Epub 2016 Jul 15.
Boron difluoride of 3-amino-1,3-diphenyl-2-propene-1-onate (1) has been synthesized and its crystal structure has been determined. The comparative studies of 1 and its oxygen analog 1,3-diphenyl-1,3-dionate (dibenzoylmethanate) of boron difluoride (2) have been performed using the methods of stationary and time-resolved spectroscopy and quantum chemical modeling. It was established that at the transition from solutions to crystals, a bathochromic shift of the spectra and a significant increase of luminescence intensity of 1 take place. The luminescent properties of solutions of 1 and 2 are similar. The peculiarities of crystal packings of 1 and 2 are responsible for differences in crystals luminescent properties. For crystals of 2, one observes the luminescence of J-aggregates and excimers, while for 1, in which a dimer is an elementary structural fragment, only the excimer luminescence is registered. A delayed excimer fluorescence of the P-type was observed for crystals of 1 and 2 at room temperature. The intensity of the delayed fluorescence of 1 is 300-fold higher than that of 2. Graphical Abstract Luminescence of J-aggregates and the formation of excimers in crystals of 1 and 2.
合成了3-氨基-1,3-二苯基-2-丙烯-1-酮酸酯（1）的二氟化硼，并测定了其晶体结构。使用稳态和时间分辨光谱法以及量子化学建模方法对1及其氧类似物二氟化硼的1,3-二苯基-1,3-二酮酸酯（二苯甲酰甲烷酸酯）（2）进行了比较研究。结果表明，从溶液转变为晶体时，1的光谱发生红移且发光强度显著增加。1和2溶液的发光性质相似。1和2晶体堆积的特殊性导致了晶体发光性质的差异。对于2的晶体，观察到J-聚集体和准分子的发光，而对于以二聚体为基本结构片段的1，仅记录到准分子发光。在室温下，1和2的晶体均观察到P型延迟准分子荧光。1的延迟荧光强度比2高300倍。图形摘要1和2晶体中J-聚集体的发光及准分子的形成。
