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题名: Orientation and Structure of Ionic Liquid Cation at Air/[bmirn][BF4] Aqueous Solution Interface
作者: Deng, Gang-hua1;  Li, Xia2;  Guo, You-qi3;  Liu, Shi-lin1;  Lu, Zhou2;  Guo, Yuan2
关键词: Sum frequency generation vibratinal spectroscopy ;  Ionic liquid ;  Aqueous solution ;  Interface ;  orientation
刊名: CHINESE JOURNAL OF CHEMICAL PHYSICS
发表日期: 2013-10-01
DOI: 10.1063/1674-0068/26/05/569-575
卷: 26, 期:5, 页:569-575
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Physics, Atomic, Molecular & Chemical
研究领域[WOS]: Physics
英文摘要: The water-miscible room temperature ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]) is a model system for studying the interactions between ionic liquid and water molecules. In this work the orientational structure of the low concentrated aqueous solution of [bmim][BF4] at the air/liquid interface was investigated by sum frequency generation vibrational spectroscopy. It has been found that at very low concentrations, the butyl chain exhibited a significant gauche defect, indicating a disordered conformation; and the cation ring oriented with a fairly small tilting angle at the surface. When the concentration increased, the cation ring tended to lie flat at the surface, and the gauche defects of the butyl chain decreased due to the intermolecular chain-chain interactions and the consequent more ordered interfacial molecular arrangement. Additionally, the anti-symmetric stretching mode in the PPP and SPS spectra exhibited a peak shift, showing that there exists more than one kind of orientation or chemical environment for the butyl CH3 group. These results may shed new light on understanding the surface behavior of water-miscible ionic liquids as well as the imidazolium based surfactants.
关键词[WOS]: SUM-FREQUENCY GENERATION ;  SURFACE-TENSION MEASUREMENT ;  VIBRATIONAL SPECTROSCOPY ;  1-BUTYL-3-METHYLIMIDAZOLIUM TETRAFLUOROBORATE ;  AGGREGATION BEHAVIOR ;  MICELLE FORMATION ;  BINARY-MIXTURES ;  WATER ;  TEMPERATURE ;  CONFORMATION
语种: 英语
WOS记录号: WOS:000326985400012
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/137994
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.Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China
2.Chinese Acad Sci, Inst Chem, State Key Lab Mol React Dynam, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
3.Nanjing Univ Aeronaut & Astronaut, Nanjing 211106, Jiangsu, Peoples R China

Recommended Citation:
Deng, Gang-hua,Li, Xia,Guo, You-qi,et al. Orientation and Structure of Ionic Liquid Cation at Air/[bmirn][BF4] Aqueous Solution Interface[J]. CHINESE JOURNAL OF CHEMICAL PHYSICS,2013,26(5):569-575.
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