Hydrogen bond effect on the Raman spectrum of liquid ethylene carbonate

✍ Scribed by Ying-Te Lee

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 336 KB
• Volume: 28
• Category: Article
• ISSN: 0377-0486
• DOI: 10.1002/(sici)1097-4555(199711)28:11<833::aid-jrs165>3.0.co;2-m

✦ Synopsis

The Raman spectra of three ring vibrational modes and and the Fermi resonance of ethylene (m 5 , m 6 m 7 ) m 2 -2m 7 carbonate in the solvents TMOS, benzene, methanol and water were studied as a function of concentration at room temperature. The pure dilution e †ect in non-polar solvents, as expected, reduces both the non-coincidence and the Fermi resonance. However, in polar solvents, the solvent-solute hydrogen bond formation has the e †ect of reducing the non-coincidence values of the vibration and enhancing the Fermi resonance. It was also found that the m 5 m 2 -2m 7 Fermi coupling constant of ethylene carbonate, instead of being a constant, is a †ected by both the pure dilution e †ect and the hydrogen bond formation e †ect. However, in the limit of very low concentration, the Fermi coupling constant is indeed solvent independent and agrees with those reported in the literature, which in turn implies that the solvent-solute hydrogen bond has a limited e †ective range.