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Deep UV resonance Raman spectroscopic study of C n F 2n+2 molecules: the excitation of C–C σ bond
Author(s) -
Jin Shaoqing,
Guo Meiling,
Fan Fengtao,
Yang Jingxiu,
Zhang Ying,
Huang Baokun,
Feng Zhaochi,
Li Can
Publication year - 2013
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.4188
Subject(s) - raman spectroscopy , excited state , resonance (particle physics) , resonance raman spectroscopy , molecule , delocalized electron , chemistry , raman scattering , excitation , coherent anti stokes raman spectroscopy , nuclear magnetic resonance , analytical chemistry (journal) , atomic physics , physics , optics , organic chemistry , quantum mechanics , chromatography
The σ–σ* transition of C–C bond in C n F 2n+2 molecules was studied by deep UV resonance Raman spectroscopy. With the C–C σ bond selectively excited by the deep UV laser at 177.3 nm, the resonance Raman spectra of C n F 2n+2 molecules were obtained on our home‐assembled deep UV Raman spectrograph. The Raman bands at 1299, 1380 and 2586 cm −1 due to the C–C skeletal stretching modes are evidently enhanced owing to the resonance Raman effect. Based on the resonance Raman spectra and theoretical calculation results, it is proposed that the electronic geometry of C n F 2n+2 molecules at the σσ* excited state is displaced along the directions perpendicular and parallel to the C–C skeleton, and the excited C–C bond is not dissociative due to the delocalization of the excited electron in σ* orbital. Copyright © 2012 John Wiley & Sons, Ltd.