DICP OpenIR
C-H stretching vibrations of methyl, methylene and methine groups at the vapor/alcohol (n=1-8) interfaces
Lu, R; Gan, W; Wu, BH; Zhang, Z; Guo, Y; Wang, HF
Source PublicationJOURNAL OF PHYSICAL CHEMISTRY B
2005-07-28
DOI10.1021/jp051565q
Volume109Issue:29Pages:14118-14129
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectChemistry, Physical
WOS Research AreaChemistry
WOS KeywordSUM-FREQUENCY GENERATION ; AIR-WATER-INTERFACE ; POLYSTYRENE/POLY(METHYL METHACRYLATE) BLENDS ; LIQUID-VAPOR INTERFACE ; NORMAL-ALKYL CHAINS ; MOLECULAR-ORIENTATION ; POLY(METHYL METHACRYLATE) ; SURFACE-STRUCTURES ; RAMAN-SPECTRUM ; 2ND-HARMONIC GENERATION
AbstractIn IR and Raman spectral studies, the congestion of the vibrational modes in the C-H stretching region between 2800 and 3000 cm(-1) has complicated spectral assignment, conformational analysis, and structural and dynamics studies, even with quite a few of the simplest molecules. To resolve these issues, polarized spectra measurement on a well aligned sample is generally required. Because the liquid interface is generally ordered and molecularly thin, and sum frequency generation vibrational spectroscopy (SFG-VS) is an intrinsically coherent polarization spectroscopy, SFG-VS can be used for discerning details in vibrational spectra of the interfacial molecules. Here we show that, from systematic molecular symmetry and SFG-VS polarization analysis, a set of polarization selection rules could be developed for explicit assignment of the SFG vibrational spectra of the C-H stretching modes. These polarization selection rules helped assignment of the SFG-VS spectra of vapor/alcohol (n = 1-8) interfaces with unprecedented details. Previous approach on assignment of these spectra relied on IR and Raman spectral assignment, and they were not able to give such detailed assignment of the SFG vibrational spectra. Sometimes inappropriate assignment was made, and consequently misleading conclusions on interfacial structure, conformation and even dynamics were reached. With these polarization rules in addition to knowledge from IR and Raman studies, new structural information and understanding of the molecular interactions at these interfaces were obtained, and some new spectral features for the C-H stretching modes were also identified. Generally speaking, these new features can be applied to IR and Raman spectroscopic studies in the condensed phase. Therefore, the advancement on vibrational spectra assignment may find broad applications in the related fields using IR and Raman as vibrational spectroscopic tools.
Language英语
WOS IDWOS:000230698100039
Citation statistics
Cited Times:239[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/139850
Collection中国科学院大连化学物理研究所
Affiliation1.Chinese Acad Sci, Inst Chem, State Key Lab Mol React Dynam, Beijing 100080, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100864, Peoples R China
Recommended Citation
GB/T 7714
Lu, R,Gan, W,Wu, BH,et al. C-H stretching vibrations of methyl, methylene and methine groups at the vapor/alcohol (n=1-8) interfaces[J]. JOURNAL OF PHYSICAL CHEMISTRY B,2005,109(29):14118-14129.
APA Lu, R,Gan, W,Wu, BH,Zhang, Z,Guo, Y,&Wang, HF.(2005).C-H stretching vibrations of methyl, methylene and methine groups at the vapor/alcohol (n=1-8) interfaces.JOURNAL OF PHYSICAL CHEMISTRY B,109(29),14118-14129.
MLA Lu, R,et al."C-H stretching vibrations of methyl, methylene and methine groups at the vapor/alcohol (n=1-8) interfaces".JOURNAL OF PHYSICAL CHEMISTRY B 109.29(2005):14118-14129.
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