Bulletin of materials science | |
Five different colours solid-state fluorescence of azastilbenes: a new push�?�pull �-conjugated system | |
Nawong Boonnak2  Suchada Chantrapromma1  Pumsak Ruanwas1  | |
[1] Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Prince of Songkla University, Hat-Yai, Songkhla 90112, Thailand$$Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Prince of Songkla University, Hat-Yai, Songkhla 90112, ThailandDepartment of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Prince of Songkla University, Hat-Yai, Songkhla 90112, Thailand$$;Department of Chemistry, Faculty of Science, Thaksin University, Pattalung 93110, Thailand$$Department of Chemistry, Faculty of Science, Thaksin University, Pattalung 93110, ThailandDepartment of Chemistry, Faculty of Science, Thaksin University, Pattalung 93110, Thailand$$ | |
关键词: Dipole interaction; multi-colour fluorescence; pushâ€�?�pull azastilbene; quantum yield; solid-state fluorescence.; | |
DOI : | |
学科分类:材料工程 | |
来源: Indian Academy of Sciences | |
【 摘 要 】
Five push�?�pull azastilbene derivatives [R = −OH (1), −OCH3 (2), −OCH2CH3 (3), −N(CH3)2 (4) and −N(CH2CH3)2 (5)] have been synthesized and successfully characterized by 1H NMR, ultraviolet�?�visible (UV�?�Vis) and Fourier-transform infrared (FT-IR) spectroscopy. Compounds 1�??5 possess solid-state fluorescence in five different colours ranging from blue to orange (�ex at 400 nm) in which blue (�em at 474 nm) for 1, bright-blue (�ex at 469 nm) for 2, green (�ex at 537 nm) for 3, yellow (�ex at 568 nm) for 4 and orange (�em at 540, 630 nm) for 5. Compounds 4 and 5 exhibited strong fluorescence with quantum yield values 0.61 and 0.84, respectively, higher than those of 1�??3. Moreover, liquid-state fluorescence performed in non-polar solvent in order to investigate the effect of dipolar intermolecular interactions on their fluorescence properties, the results revealed that the emission spectra of 1�?5 in liquid state are similar to those of solid state, indicating that no significant dipolar interactions were observed. Therefore, the substituent with electron-donating group as N- or O-donor and electron-withdrawing group as �?�SO3H, on the azastilbene skeleton play a major role on their solid-state fluorescence.
【 授权许可】
Unknown
【 预 览 】
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RO201912010230178ZK.pdf | 1308KB | download |