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题名: Spectral assignment and orientational analysis in a vibrational sum frequency generation study of DPPC monolayers at the air/water interface
作者: Feng, Rong-Juan1, 2, 3;  Li, Xia1, 2, 3;  Zhang, Zhen1, 2;  Lu, Zhou1, 2;  Guo, Yuan1, 2, 3
刊名: JOURNAL OF CHEMICAL PHYSICS
发表日期: 2016-12-28
DOI: 10.1063/1.4972564
卷: 145, 期:24
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical ;  Physics, Atomic, Molecular & Chemical
研究领域[WOS]: Chemistry ;  Physics
英文摘要: The interfacial behavior of the benchmark zwitterionic phospholipid molecule dipalmitoylphosphatidylcholine (DPPC) has been extensively investigated by surface-selective vibrational sum frequency generation spectroscopy (VSFG). However, there is still a lack of agreement between various orientational measurements of phospholipid monolayers at the air/water interface, mainly because of the difficulty in assigning congested VSFG features. In this study, polarization-dependent VSFG measurements reveal a frequency shift between the in-plane and out-of-plane antisymmetric stretching modes of the terminal methyl groups in the DPPC alkyl tails, favoring the model of C-s local symmetry rather than the previously assumed C-3v symmetry. Further VSFG experiments of isotopically labeled DPPC successfully capture the vibrational signatures of the glycerol backbone. With the newly derived VSFG polarization selection rules for C-s symmetry and the refreshed spectral assignments, the average tilt angles of the alkyl tail groups, choline headgroup, and glycerol backbone of DPPC molecules can all be determined, showing the powerful capability of VSFG spectroscopy in revealing the structural details at interfaces. The VSFG polarization dependence rules and the orientational analysis procedures developed for Cs symmetry in this work are applicable to other bulky molecules in which the methyl group cannot freely rotate, and they therefore have general applications in future VSFG studies. Published by AIP Publishing.
关键词[WOS]: AIR-WATER-INTERFACE ;  LANGMUIR-BLODGETT-FILMS ;  SELF-ASSEMBLED MONOLAYERS ;  LIQUID-LIQUID INTERFACE ;  CH STRETCHING MODES ;  PHASE-TRANSITIONS ;  LIPID MONOLAYER ;  PHOSPHOLIPID MONOLAYERS ;  MOLECULAR-ORIENTATION ;  GOLD NANOPARTICLES
语种: 英语
WOS记录号: WOS:000392174800047
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/151878
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.Chinese Acad Sci, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Inst Chem, State Key Lab Mol React Dynam, Beijing 100190, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

Recommended Citation:
Feng, Rong-Juan,Li, Xia,Zhang, Zhen,et al. Spectral assignment and orientational analysis in a vibrational sum frequency generation study of DPPC monolayers at the air/water interface[J]. JOURNAL OF CHEMICAL PHYSICS,2016,145(24).
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