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题名: Unraveling heterogeneous microviscosities of the 1-alkyl-3-methylimidazolium hexafluorophosphate ionic liquids with different chain lengths
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
发表日期: 2013
DOI: 10.1039/c3cp52724g
卷: 15, 期:38, 页:16074-16081
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical ;  Physics, Atomic, Molecular & Chemical
研究领域[WOS]: Chemistry ;  Physics
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.
关键词[WOS]: COMPLETE SOLVATION RESPONSE ;  PLUS POLY(ETHYLENE GLYCOL) ;  1-BUTYL-3-METHYLIMIDAZOLIUM HEXAFLUOROPHOSPHATE ;  ROTATIONAL-DYNAMICS ;  COUMARIN 153 ;  NANOSTRUCTURAL ORGANIZATION ;  TEMPERATURE-DEPENDENCE ;  SPECTROSCOPIC EVIDENCE ;  TETRAETHYLENE GLYCOL ;  LOCAL VISCOSITY
语种: 英语
WOS记录号: WOS:000324412300047
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/137956
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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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

Recommended Citation:
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.
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