Salt effect on molecular orientation at air/liquid methanol interface

doi:10.1016/j.cclet.2016.01.004

	Salt effect on molecular orientation at air/liquid methanol interface
	Guo, Yuan 1; Lu, Zhou 1; Li, Xia 1; Deng, Gang-Hua 2; Feng, Rong-Juan 1; Lin, Ke 3; Zhang, Zhen 1; Bai, Yu 1
刊名	CHINESE CHEMICAL LETTERS
	2016-04-01
卷号	27 期号:4 页码:535-539
关键词	Surface Orientation Air/liquid Interface Salt Effect Sum Frequency Generation Methanol
ISSN号	1001-8417
DOI	10.1016/j.cclet.2016.01.004
文献子类	Article
英文摘要	The 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.
WOS关键词	LIQUID-VAPOR INTERFACE ; GENERATION VIBRATIONAL SPECTROSCOPY ; AIR/WATER INTERFACE ; AQUEOUS INTERFACES ; WATER-SURFACE ; IONS ; SIMULATIONS ; SEGREGATION
WOS研究方向	Chemistry
语种	英语
出版者	ELSEVIER SCIENCE INC
WOS记录号	WOS:000375506600010
内容类型	期刊论文
源URL	[http://cas-ir.dicp.ac.cn/handle/321008/170806]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
通讯作者	Guo, Yuan; Lu, Zhou
作者单位	1.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
推荐引用方式 GB/T 7714	Guo, Yuan,Lu, Zhou,Li, Xia,et al. Salt effect on molecular orientation at air/liquid methanol interface[J]. CHINESE CHEMICAL LETTERS,2016,27(4):535-539.
APA	Guo, Yuan.,Lu, Zhou.,Li, Xia.,Deng, Gang-Hua.,Feng, Rong-Juan.,...&Bai, Yu.(2016).Salt effect on molecular orientation at air/liquid methanol interface.CHINESE CHEMICAL LETTERS,27(4),535-539.
MLA	Guo, Yuan,et al."Salt effect on molecular orientation at air/liquid methanol interface".CHINESE CHEMICAL LETTERS 27.4(2016):535-539.