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Absolute Orientation of Molecules with Competing Hydrophilic Head Groups at the Air/Water Interface Probed with Sum Frequency Generation Vibrational Spectroscopy
Wang, Feng1,2; Huang, Zhi2,3; Cui, Zhi-feng1; Wang, Hong-fei1,2
KeywordSum Frequency Generation Vibrational Spectroscopy Air/water Interface Molecule Orientation P-cyanophenol
Source PublicationCHINESE JOURNAL OF CHEMICAL PHYSICS
2009-04-01
DOI10.1088/1674-0068/22/02/197-203
Volume22Issue:2Pages:197-203
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectPhysics, Atomic, Molecular & Chemical
WOS Research AreaPhysics
WOS KeywordSURFACE 2ND-HARMONIC GENERATION ; AIR-WATER-INTERFACE ; PHASE MEASUREMENT ; SFG-VS ; ADSORPTION LAYERS ; LIQUID INTERFACE ; NONLINEAR OPTICS ; MONOLAYER ; CONFORMATION ; ENERGETICS
AbstractThe 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.
Language英语
WOS IDWOS:000265896000016
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/141422
Collection中国科学院大连化学物理研究所
Affiliation1.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
GB/T 7714
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.
APA Wang, Feng,Huang, Zhi,Cui, Zhi-feng,&Wang, Hong-fei.(2009).Absolute Orientation of Molecules with Competing Hydrophilic Head Groups at the Air/Water Interface Probed with Sum Frequency Generation Vibrational Spectroscopy.CHINESE JOURNAL OF CHEMICAL PHYSICS,22(2),197-203.
MLA Wang, Feng,et al."Absolute Orientation of Molecules with Competing Hydrophilic Head Groups at the Air/Water Interface Probed with Sum Frequency Generation Vibrational Spectroscopy".CHINESE JOURNAL OF CHEMICAL PHYSICS 22.2(2009):197-203.
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