Vibrational Spectra of the Polymorphic Solids of Methylene Iodide

Polarized infrared spectra of single crystals of methylene iodide solid I and the laser–Raman spectra of polycrystalline solid I at 90°K have been measured. The absence of the a2 fundamental in the infrared spectrum and the lack of crystal-field splitting in both the infrared and Raman spectra sugge...

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Bibliographic Details
Published in:The Journal of chemical physics 1968-01, Vol.49 (11), p.4806-4812
Main Authors: Brown, C. W., Obremski, R. J., Allkins, J. R., Lippincott, E. R.
Format: Article
Language:English
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Summary:Polarized infrared spectra of single crystals of methylene iodide solid I and the laser–Raman spectra of polycrystalline solid I at 90°K have been measured. The absence of the a2 fundamental in the infrared spectrum and the lack of crystal-field splitting in both the infrared and Raman spectra suggest that the site group for the solid I phase is C2υ. The infrared polarization results confirm this assignment of the site group and further indicate that solid I belongs to the orthorhombic crystal system with either C2υ or D2h factor group symmetry. The laser–Raman spectrum of a polycrystalline film of methylene iodide solid II has also been recorded. The observed correlation splittings give new spectroscopic evidence for the previous assignment of the crystal structure as monoclinic C2h.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.1669963