Unraveling heterogeneous microviscosities of the 1-alkyl-3-methylimidazolium hexafluorophosphate ionic liquids with different chain lengths
文献类型：期刊论文
| 作者 | Li, Boxuan1,2; Qiu, Meng1,2; Long, Saran1,2; Wang, Xuefei1,2; Guo, Qianjin1,2; Xia, Andong1,2 |
| 刊名 | PHYSICAL CHEMISTRY CHEMICAL PHYSICS
 |
| 出版日期 | 2013 |
| 卷号 | 15期号:38页码:16074-16081 |
| ISSN号 | 1463-9076 |
| DOI | 10.1039/c3cp52724g |
| 英文摘要 | The rotational dynamics of coumarin 153 (C153) have been investigated in a series of 1-alkyl-3-methylimidazolium hexafluorophosphate ionic liquids with different alkyl chain lengths (alkyl = butyl, pentyl, hexyl, heptyl, octyl) ([C(n)mim][PF6], n = 4-8) to examine the alkyl chain length dependent local viscosity of the microenvironment surrounding the probe molecules. The excimer-to-monomer fluorescence emission intensity ratio (I-E/I-M) of a well-known microviscosity probe, 1,3-bis(1-pyrenyl) propane (BPP), is also employed to study the microviscosity of [C(n)mim][PF6] as a complementary measurement. The rotational dynamics of C153 show that at a certain length of the alkyl chain there are incompact and compact domains within [C(n)mim][PF6], resulting in fast and slow components of C153 rotational dynamics. The microviscosities in different structural domains of [C(n)mim][PF6] with different alkyl chain lengths are investigated by studying the fluorescence anisotropy decay of probe molecules. The obtained average rotation time constants show that with an increase in the length of the alkyl chain, the microviscosity of [C(n)mim][PF6] is obviously increased first and then slightly decreased. The steady state fluorescence measurements with the microviscosity probe of BPP further prove that the microviscosity is not increased as much as expected when ionic liquids [C(n)mim][PF6] have a relatively long alkyl chain. The different heterogeneous structures of [C(n)mim][PF6] with different lengths of the alkyl chain are proposed to interpret the unusual microviscosity behaviors. |
| 语种 | 英语 |
| WOS记录号 | WOS:000324412300047 |
| 出版者 | ROYAL SOC CHEMISTRY |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/53729]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Guo, Qianjin |
| 作者单位 | 1.Chinese Acad Sci, Inst Chem, State Key Lab Mol React Dynam, Beijing 100190, Peoples R China 2.Chinese Acad Sci, Inst Chem, BNLMS, Beijing 100190, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Boxuan,Qiu, Meng,Long, Saran,et al. Unraveling heterogeneous microviscosities of the 1-alkyl-3-methylimidazolium hexafluorophosphate ionic liquids with different chain lengths[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2013,15(38):16074-16081. |
| APA | Li, Boxuan,Qiu, Meng,Long, Saran,Wang, Xuefei,Guo, Qianjin,&Xia, Andong.(2013).Unraveling heterogeneous microviscosities of the 1-alkyl-3-methylimidazolium hexafluorophosphate ionic liquids with different chain lengths.PHYSICAL CHEMISTRY CHEMICAL PHYSICS,15(38),16074-16081. |
| MLA | Li, Boxuan,et al."Unraveling heterogeneous microviscosities of the 1-alkyl-3-methylimidazolium hexafluorophosphate ionic liquids with different chain lengths".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 15.38(2013):16074-16081. |
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来源：化学研究所
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