Enhanced fluorescence of [[5'-(4-hydroxyphenyl)-[2,2'-bithiophen]-5-yl]methylene]-propanedinitrile (NIAD-4): solvation induced micro-viscosity enhancement
文献类型：期刊论文
| 作者 | Hu, Jiangpu; Zhu, Huaning; Li, Yang; Wang, Xian; Ma, Renjun; Guo, Qianjin; Xia, Andong |
| 刊名 | PHYSICAL CHEMISTRY CHEMICAL PHYSICS
 |
| 出版日期 | 2016-07-28 |
| 卷号 | 18期号:28页码:18750-18757 |
| 英文摘要 | Excited state solvation plays a very important role in modulating the emission behavior of fluorophores upon excitation. Here, the solvation effects on the local micro-environment around a fluorophore are proposed by investigating the fantastic emission behavior of a novel amyloid fibril marker, NIAD-4, in different alcoholic and aprotic solvents. In alcoholic solvents, high solvent viscosity causes an obvious enhancement of fluorescence because of the restriction of torsion of NIAD-4, where the formation of a non-fluorescent twist intramolecular charge transfer (TICT) state is suppressed. In aprotic solvents, high solvent polarity leads to a remarkable redshift of the emission spectra suggesting strong solvation. Surprisingly, an abnormal fluorescence enhancement of NIAD-4 is observed with increasing solvent polarity of the aprotic solvents, whereas solvent viscosity plays little role in influencing the fluorescence intensity. We conclude that such an abnormal phenomenon is originated from a solvation induced micro-viscosity enhancement around the fluorophore upon excitation which restricts the torsion of NIAD-4. Femtosecond transient absorption results further prove such a micro-viscosity increasing mechanism. We believe that this solvation induced micro-viscosity enhancement effect on fluorescence could widely exist for most donor-pi-acceptor (D-pi-A) compounds in polar solvents, which should be carefully taken into consideration when probing the micro-viscosity in polar environments, especially in complex bioenvironments. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/35182]  |
| 专题 | 化学研究所_光化学实验室 |
| 作者单位 | Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China |
| 推荐引用方式 GB/T 7714 | Hu, Jiangpu,Zhu, Huaning,Li, Yang,et al. Enhanced fluorescence of [[5'-(4-hydroxyphenyl)-[2,2'-bithiophen]-5-yl]methylene]-propanedinitrile (NIAD-4): solvation induced micro-viscosity enhancement[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2016,18(28):18750-18757. |
| APA | Hu, Jiangpu.,Zhu, Huaning.,Li, Yang.,Wang, Xian.,Ma, Renjun.,...&Xia, Andong.(2016).Enhanced fluorescence of [[5'-(4-hydroxyphenyl)-[2,2'-bithiophen]-5-yl]methylene]-propanedinitrile (NIAD-4): solvation induced micro-viscosity enhancement.PHYSICAL CHEMISTRY CHEMICAL PHYSICS,18(28),18750-18757. |
| MLA | Hu, Jiangpu,et al."Enhanced fluorescence of [[5'-(4-hydroxyphenyl)-[2,2'-bithiophen]-5-yl]methylene]-propanedinitrile (NIAD-4): solvation induced micro-viscosity enhancement".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 18.28(2016):18750-18757. |
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来源：化学研究所
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