中国物理B ›› 2012, Vol. 21 ›› Issue (8): 83301-083301.doi: 10.1088/1674-1056/21/8/083301
• ATOMIC AND MOLECULAR PHYSICS • 上一篇 下一篇
李东飞a b, 高淑琴b, 孙成林a b, 里佐威a b
Li Dong-Fei (李东飞)a b, Gao Shu-Qin (高淑琴)b, Sun Cheng-Lin (孙成林)a b, Li Zuo-Wei (里佐威 )a b
摘要: The effects of anti-hydrogen bond on the ν1—ν12 Fermi resonance (FR) of pyridine are experimentally investigated by using Raman scattering spectroscopy. Three systems, pyridine/water, pyridine/formamide, pyridine/carbon tetrachloride, provide varying degrees of strength for the diluent-pyridine anti-hydrogen bond complex. Water forms a stronger anti-hydrogen bond with pyridine than with formamide, and in the case of adding non-polar solvent carbon tetrachloride, which is neither a hydrogen bond donor nor an acceptor and incapable of forming hydrogen bond with pyridine, the intermolecular distance of pyridine will increase and the interaction of pyridine molecules will reduce. The dilution studies are performed on the three systems. Comparing with the values of Fermi coupling coefficient W of the ring breathing mode ν 1 and triangle mode ν 12 of pyridine at different volume concentrations, which are calculated according to the Bertran equations, in three systems, we find that the solution with the strongest anti-hydrogen bond, water, shows the fastest change in the ν1—ν12 Fermi coupling coefficient W with the volume concentration varying, followed by the formamide and carbon tetrachloride solutions. These results suggest that the stronger anti-hydrogen bond-forming effect will cause a greater reduction in the strength of the ν1—ν12 FR of pyridine. According to the mechanism of the formation of anti-hydrogen bond in the complexes and the FR theory, a qualitative explanation for the anti-hydrogen bond effect in reducing the strength of the ν1—ν12 FR of pyridine is given.
中图分类号: (Raman and Rayleigh spectra (including optical scattering) ?)