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Salt effect on molecular orientation at air/liquid methanol interface
Li, Xia1; Deng, Gang-Hua2; Feng, Rong-Juan1; Lin, Ke3; Zhang, Zhen1; Bai, Yu1; Lu, Zhou1; Guo, Yuan1
KeywordSurface Orientation Air/liquid Interface Salt Effect Sum Frequency Generation Methanol
Source PublicationCHINESE CHEMICAL LETTERS
2016-04-01
ISSN1001-8417
DOI10.1016/j.cclet.2016.01.004
Volume27Issue:4Pages:535-539
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectChemistry, Multidisciplinary
WOS Research AreaChemistry
WOS KeywordLIQUID-VAPOR INTERFACE ; GENERATION VIBRATIONAL SPECTROSCOPY ; AIR/WATER INTERFACE ; AQUEOUS INTERFACES ; WATER-SURFACE ; IONS ; SIMULATIONS ; SEGREGATION
AbstractThe salt effects on molecular orientation at air/liquid methanol interface were investigated by the polarization-dependent sum frequency generation vibrational spectroscopy (SFG-VS). We clarified that the average tilting angle of the methyl group to be theta = 30 degrees +/- 5 degrees at the air/pure methanol surface assuming a delta-function orientational distribution. Upon the addition of 3 mol/L NaI, the methyl group tilts further away from the surface normal with a new theta = 41 degrees +/- 3 degrees. This orientational change does not explain the enhancement of the SFG-VS intensities when adding NaI, implying the number density of the methanol molecules with a net polar ordering in the surface region also changed with the NaI concentrations. These spectroscopic findings shed new light on the salt effects on the surfaces structures of the polar organic solutions. It was also shown that the accurate determination of the bulk refractive indices and Raman depolarization ratios for different salt concentrations is crucial to quantitatively interpret the SFG-VS data. (C) 2016 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.
Language英语
WOS IDWOS:000375506600010
PublisherELSEVIER SCIENCE INC
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Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/170807
Collection中国科学院大连化学物理研究所
Corresponding AuthorLu, Zhou; Guo, Yuan
Affiliation1.Chinese Acad Sci, Inst Chem, State Key Lab Mol React Dynam, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
2.Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China
3.Xidian Univ, Sch Phys & Optoelect Engn, Xian 710071, Peoples R China
Recommended Citation
GB/T 7714
Li, Xia,Deng, Gang-Hua,Feng, Rong-Juan,et al. Salt effect on molecular orientation at air/liquid methanol interface[J]. CHINESE CHEMICAL LETTERS,2016,27(4):535-539.
APA Li, Xia.,Deng, Gang-Hua.,Feng, Rong-Juan.,Lin, Ke.,Zhang, Zhen.,...&Guo, Yuan.(2016).Salt effect on molecular orientation at air/liquid methanol interface.CHINESE CHEMICAL LETTERS,27(4),535-539.
MLA Li, Xia,et al."Salt effect on molecular orientation at air/liquid methanol interface".CHINESE CHEMICAL LETTERS 27.4(2016):535-539.
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