DICP OpenIR
Unraveling heterogeneous microviscosities of the 1-alkyl-3-methylimidazolium hexafluorophosphate ionic liquids with different chain lengths
Li, Boxuan1,2; Qiu, Meng1,2; Long, Saran1,2; Wang, Xuefei1,2; Guo, Qianjin1,2; Xia, Andong1,2
Source PublicationPHYSICAL CHEMISTRY CHEMICAL PHYSICS
2013
DOI10.1039/c3cp52724g
Volume15Issue:38Pages:16074-16081
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectChemistry, Physical ; Physics, Atomic, Molecular & Chemical
WOS Research AreaChemistry ; Physics
WOS KeywordCOMPLETE 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
AbstractThe 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.
Language英语
WOS IDWOS:000324412300047
Citation statistics
Cited Times:17[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/137956
Collection中国科学院大连化学物理研究所
Affiliation1.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
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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