Molecular Vibrations of Quinones. IV. Raman Spectra ofphyphen;Benzoquinone and Its Centrosymmetrically Substituted Isotopic Derivatives and Assignment of Observed Frequencies

摘要

The Raman spectra ofphyphen;benzoquinone, quinonehyphen;d4, quinonehyphen;18O2, quinonehyphen;d4hyphen;18O2, and quinonehyphen;2,5hyphen;d2, excited by the helium radiation 5875.6 Aring;, are reported, together with semiquantitative measurements of the intensities and qualitative observations on the state of polarization of the Raman shifts. The results are fully consistent with theD2hsymmetry of the four molecular species mentioned first, the last one belonging to the point groupC2h. A tentative assignment for all Ramanhyphen;active fundamental vibrational modes of the investigated compounds is given.