DICP OpenIR
Determination of the Hydrogen-Bonding Induced Local Viscosity Enhancement in Room Temperature Ionic Liquids via Femtosecond Time-Resolved Depleted Spontaneous Emission
Ma, Xiaonan; Yan, Linyin; Wang, Xuefei; Guo, Qianjin1; Xia, Andong
刊名JOURNAL OF PHYSICAL CHEMISTRY A
2011-07-14
DOI10.1021/jp202391m
115期:27页:7937-7947
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
关键词[WOS]SOLVENT-SENSITIVE FLUOROPHORE ; SOLVATION DYNAMICS ; ROTATIONAL RELAXATION ; PHOTOPHYSICAL PROPERTIES ; TRANSIENT ABSORPTION ; SPECTRAL PROPERTIES ; ELECTRON-TRANSFER ; SOLUTE ROTATION ; DYE MOLECULES ; FLUORESCENCE
英文摘要The fluorescence depletion dynamics of Rhodamine 700 (R-700) molecules in room temperature ionic liquids (RTILs) 1-ethyl-3-methylimidazolium tetrafluoroborate ([emim][BF4]) and 1-hydroxyethyl-3-methylimidazolium tetrafluoroborate ([HOemim]-[BF4]) were investigated to determine the local viscosity of the microenvironment surrounding the fluorescent molecules, which is induced by strong hydrogen bonding interaction between cationic and anionic components in RTILs. The solvation and rotation dynamics of R-700 molecules in RTILs show slower time constants relative to that in conventional protic solvents with the same bulk viscosity, indicating that the probe molecule is facing a more viscous microenvironment in RTILs than in conventional solvents because of the strong hydrogen bonding interaction between cationic and anionic components. In addition, this effect is more pronounced in hydroxyl-functionalized ionic liquid than in the regular RTIL due to the presence of a hydroxyl group as a strong hydrogen bonding donor. The hydrogen-bonding-induced local viscosity enhancement effect related to the heterogeneity character of RTILs is confirmed by the nonexponential rotational relaxation of R-700 determined by time-correlated single photon counting (TCSPC). The geometry of hydrogen bonding complexes with different components and sizes are further optimized by density functional theory methods to show the possible hydrogen-bond networks. A model of the hydrogen-bonding network in RTILs is further proposed to interpret the observed specific solvation and local viscosity enhancement effect in RTILs, where most of the fluoroprobes exist as the free nonbonding species in the RTIL solutions and are surrounded by the hydrogen-bonding network formed by the strong hydrogen-bonding between the cationic and anionic components in RTIL. The optimized geometry of hydrogen bonding complexes with different components and sizes by density functional theory methods confirms the local viscosity enhancement effect deduced from fluorescence depletion and TCSPC experiments. The calculated interaction energies reveal the existence of the stronger hydrogen bonding network in RTILs (especially in hydroxyl-functionalized ionic liquid) than that in conventional protic solvent, which leads to the enhancement effect of local microviscosity, and therefore leads to the slow solvation and rotation dynamics of probe molecules observed in RTILs.
语种英语
WOS记录号WOS:000292479800008
引用统计
被引频次:22[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/142294
专题中国科学院大连化学物理研究所
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
Ma, Xiaonan,Yan, Linyin,Wang, Xuefei,et al. Determination of the Hydrogen-Bonding Induced Local Viscosity Enhancement in Room Temperature Ionic Liquids via Femtosecond Time-Resolved Depleted Spontaneous Emission[J]. JOURNAL OF PHYSICAL CHEMISTRY A,2011,115(27):7937-7947.
APA Ma, Xiaonan,Yan, Linyin,Wang, Xuefei,Guo, Qianjin,&Xia, Andong.(2011).Determination of the Hydrogen-Bonding Induced Local Viscosity Enhancement in Room Temperature Ionic Liquids via Femtosecond Time-Resolved Depleted Spontaneous Emission.JOURNAL OF PHYSICAL CHEMISTRY A,115(27),7937-7947.
MLA Ma, Xiaonan,et al."Determination of the Hydrogen-Bonding Induced Local Viscosity Enhancement in Room Temperature Ionic Liquids via Femtosecond Time-Resolved Depleted Spontaneous Emission".JOURNAL OF PHYSICAL CHEMISTRY A 115.27(2011):7937-7947.
条目包含的文件
条目无相关文件。
个性服务
推荐该条目
保存到收藏夹
查看访问统计
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[Ma, Xiaonan]的文章
[Yan, Linyin]的文章
[Wang, Xuefei]的文章
百度学术
百度学术中相似的文章
[Ma, Xiaonan]的文章
[Yan, Linyin]的文章
[Wang, Xuefei]的文章
必应学术
必应学术中相似的文章
[Ma, Xiaonan]的文章
[Yan, Linyin]的文章
[Wang, Xuefei]的文章
相关权益政策
暂无数据
收藏/分享
所有评论 (0)
暂无评论
 

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。