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题名: Absolute Orientation of Molecules with Competing Hydrophilic Head Groups at the Air/Water Interface Probed with Sum Frequency Generation Vibrational Spectroscopy
作者: Wang, Feng1, 2;  Huang, Zhi2, 3;  Cui, Zhi-feng1;  Wang, Hong-fei1, 2
关键词: Sum frequency generation vibrational spectroscopy ;  Air/water interface ;  Molecule orientation ;  p-cyanophenol
刊名: CHINESE JOURNAL OF CHEMICAL PHYSICS
发表日期: 2009-04-01
DOI: 10.1088/1674-0068/22/02/197-203
卷: 22, 期:2, 页:197-203
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 constructive or destructive spectral interference between the molecular groups oriented up and down at the interface in the sum-frequency generation (SFG) spectra provides a direct measurement of the absolute orientation of these molecular groups. This simple approach can be employed to interrogate absolute molecular orientations other than using the complex absolute phase measurement in the SFG studies. We used the -CN group in the p-cyanophenol (PCP) molecule as the internal phase standard, and we measured the phases of the SFG fields of the -CN groups in the 3,5-dimethyl-4-hydroxy-benzonitrile (35DMHBN) and 2,6-dimethyl-4-hydroxy-benzonitrile (26DMHBN) at the air/water interface by measuring the SFG spectra of the aqueous surfaces of the mixtures of the PCP, 35DMHBN, and 26DMHBN solutions. The results showed that the 35DMHBN had its -CN group pointing into the aqueous phase; while the 26DMHBN, similar to the PCP, had its -CN group pointing away from the aqueous phase. The tilt angles of the -CN group for both the 35DMHBN and 26DMHBN molecules at the air/water interface were around 25 degrees-45 degrees from the interface normal. These results provided insights on the understanding of the detailed balance of the competing factors, such as solvation of the polar head groups, hydrogen bonding and hydrophobic effects, etc., on influencing the absolute molecular orientation at the air/water interface.
关键词[WOS]: SURFACE 2ND-HARMONIC GENERATION ;  AIR-WATER-INTERFACE ;  PHASE MEASUREMENT ;  SFG-VS ;  ADSORPTION LAYERS ;  LIQUID INTERFACE ;  NONLINEAR OPTICS ;  MONOLAYER ;  CONFORMATION ;  ENERGETICS
语种: 英语
WOS记录号: WOS:000265896000016
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141422
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.Anhui Normal Univ, Dept Phys, Wuhu 241000, Peoples R China
2.Chinese Acad Sci, Inst Chem, Bejing Natl Lab Mol Sci, State Key Lab Mol React Dynam, Beijing 100190, Peoples R China
3.Chinese Acad Sci, Grad Univ, Beijing 100864, Peoples R China

Recommended Citation:
Wang, Feng,Huang, Zhi,Cui, Zhi-feng,et al. Absolute Orientation of Molecules with Competing Hydrophilic Head Groups at the Air/Water Interface Probed with Sum Frequency Generation Vibrational Spectroscopy[J]. CHINESE JOURNAL OF CHEMICAL PHYSICS,2009,22(2):197-203.
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