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Orientation and Structure of Ionic Liquid Cation at Air/[bmirn][BF4] Aqueous Solution Interface
Deng, Gang-hua1; Li, Xia2; Guo, You-qi3; Liu, Shi-lin1; Lu, Zhou2; Guo, Yuan2
KeywordSum Frequency Generation Vibratinal Spectroscopy Ionic Liquid Aqueous Solution Interface Orientation
Source PublicationCHINESE JOURNAL OF CHEMICAL PHYSICS
2013-10-01
DOI10.1063/1674-0068/26/05/569-575
Volume26Issue:5Pages:569-575
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectPhysics, Atomic, Molecular & Chemical
WOS Research AreaPhysics
WOS KeywordSUM-FREQUENCY GENERATION ; SURFACE-TENSION MEASUREMENT ; VIBRATIONAL SPECTROSCOPY ; 1-BUTYL-3-METHYLIMIDAZOLIUM TETRAFLUOROBORATE ; AGGREGATION BEHAVIOR ; MICELLE FORMATION ; BINARY-MIXTURES ; WATER ; TEMPERATURE ; CONFORMATION
AbstractThe 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.
Language英语
WOS IDWOS:000326985400012
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/137994
Collection中国科学院大连化学物理研究所
Affiliation1.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
GB/T 7714
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.
APA Deng, Gang-hua,Li, Xia,Guo, You-qi,Liu, Shi-lin,Lu, Zhou,&Guo, Yuan.(2013).Orientation and Structure of Ionic Liquid Cation at Air/[bmirn][BF4] Aqueous Solution Interface.CHINESE JOURNAL OF CHEMICAL PHYSICS,26(5),569-575.
MLA Deng, Gang-hua,et al."Orientation and Structure of Ionic Liquid Cation at Air/[bmirn][BF4] Aqueous Solution Interface".CHINESE JOURNAL OF CHEMICAL PHYSICS 26.5(2013):569-575.
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