Spectroscopic Study of the Structural Heterogeneity and Microviscosity of [bmim][PF6] and [moemim][PF6] Ionic Liquids
文献类型：期刊论文
| 作者 | Li Bo-Xuan; Guo Qian-Jin; Xia An-Dong |
| 刊名 | ACTA PHYSICO-CHIMICA SINICA
 |
| 出版日期 | 2015-08-12 |
| 卷号 | 31期号:8页码:1452-1460 |
| 关键词 | Ionic liquid Microviscosity Rotational dynamics Fluorescence spectroscopy |
| 英文摘要 | Room temperature ionic liquids (RTILs), which have several special properties such as negligible vapor pressure, high thermal and chemical stability, good molecular structure and property designability, have received a great deal of attention, and have emerged as potential environmentally benign solvents. Therefore, a deep understanding of the solvent properties of RTILs, especially the microenvironment properties, is crucial to design new RTILs and extend their applications. The structural heterogeneities and local viscosities of the microenvironments of the ionic liquid [bmim][PF6] and the ether-functionalized ionic liquid [moemim][PF6] were investigated by the rotational dynamics of coumarin 153 (C153) and the excimer-to-monomer fluorescence emission intensity ratio (I-E/I-M) of 1,3-bis(1-pyrenyl)propane (BPP). The rotational dynamics of C153 shows that there are incompact and compact domains within the heterogeneous structure of [bmim][PF6], resulting in fast and slow components of C153 rotational dynamics. The rotational dynamics of C153 shows that there is mainly one type of microenvironment in [moemim][PF6]. The C153 rotation time constants show that the microviscosity of [moemim][PF6] is lower than that of [bmim][PF6], and this result is confirmed by steady-state fluorescence measurement with the BPP microviscosity probe. The side chain of [moemim][PF6] is more polar and more flexible than that of [bmim][PF6], and the oxygen of the ether group could act as a hydrogen bond acceptor and interact with the cations of the ionic liquid, which possibly reduces the electrostatic attraction between the cations and anions in the ionic liquid and leads to the lower structural heterogeneity and microviscosity of [moemim][PF6]. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2015-10-27 |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/27641]  |
| 专题 | 化学研究所_分子反应动力学实验室 |
| 作者单位 | Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Key Lab Photochem, Beijing 100190, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li Bo-Xuan,Guo Qian-Jin,Xia An-Dong. Spectroscopic Study of the Structural Heterogeneity and Microviscosity of [bmim][PF6] and [moemim][PF6] Ionic Liquids[J]. ACTA PHYSICO-CHIMICA SINICA,2015,31(8):1452-1460. |
| APA | Li Bo-Xuan,Guo Qian-Jin,&Xia An-Dong.(2015).Spectroscopic Study of the Structural Heterogeneity and Microviscosity of [bmim][PF6] and [moemim][PF6] Ionic Liquids.ACTA PHYSICO-CHIMICA SINICA,31(8),1452-1460. |
| MLA | Li Bo-Xuan,et al."Spectroscopic Study of the Structural Heterogeneity and Microviscosity of [bmim][PF6] and [moemim][PF6] Ionic Liquids".ACTA PHYSICO-CHIMICA SINICA 31.8(2015):1452-1460. |
入库方式： OAI收割
来源：化学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。