One-pot synthesis, physicochemical and photophysical properties of deep blue light-emitting highly fluorescent pyrene-imidazole dye: A combined experimental and theoretical study
作者:Salman A. Khan、Abdullah M. Asiri、Al-Anood M. Al-Dies、Osman I. Osman、Mohammad Asad、Mohie E.M. Zayed
DOI:10.1016/j.jphotochem.2018.06.015
日期:2018.9
A one-pot multi-component synthesis of 4,5,-diphenyl-2-(pyren-1-yl)-1H-imidazole (DPI) chromophore was performed by the reaction of benzil, pyrene-1-carboxaldehyde and ammonium acetate in acetic acid. Structure elucidation of DPI chromophore was confirmed by spectroscopic techniques (FT-IR, 1H NMR, 13C NMR and mass spectra). The physicochemical and photophysical parameters of DPI chromophore such as
通过苯、,-1-甲醛和乙酸铵的反应进行一锅多组分合成4,5,-二苯基-2-(吡喃-1-基)-1 H-咪唑(DPI)发色团在乙酸中。DPI发色团的结构鉴定通过光谱技术(FT-IR,1 H NMR,131 H NMR和质谱)。在不同溶剂极性的基础上,通过实验和理论计算了DPI发色团的物理化学和光物理参数,例如消光系数,振荡器强度,偶极矩,斯托克斯位移和荧光量子产率,以观察溶剂对DPI发色团的影响。DPI生色团也可用于测定阳离子和阴离子表面活性剂(如十六烷基三甲基溴化铵(CTAB)和十二烷基硫酸钠(SDS))的临界胶束浓度(CMC)。
Synthesis, optical properties, and blue electroluminescence of fluorene derivatives containing multiple imidazoles bearing polyaromatic hydrocarbons
Fluorene decorated with multiple imidazole units in a non-conjugated fashion and featuring polyaromatic hydrocarbons such as anthracene or pyrene were synthesized and characterized as blue emitters suitable for application in organic light-emitting diodes. The optical absorption and emission peak profiles remained unaltered on increasing the imidazole loading on fluorene. But the molar extinction coefficient progressively increased on introduction of additional imidazole unit attributable to the increment in the chromophore density. Replacement of phenyl group at the C-2 of imidazole nucleus with polyaromatic hydrocarbons such as anthracene and pyrene led to a red-shift in the absorption and emission spectra due to their characteristic absorption features. All the compounds exhibited high thermal decomposition temperature in the range 395-509 degrees C showing significant thermal robustness. The anthracene and pyrene derivatives were demonstrated as efficient blue emitters in 4,4'-di(9H-carbazol-9-y1)-1,1'-biphenyl host for multilayered organic light-emitting diodes. (C) 2013 Elsevier Ltd. All rights reserved.