Article

Spectroscopy of the C–H Stretching Vibrational Band in Selected Organic Molecules

Jiří ŠebekInstitute of Chemistry and The Fritz Haber Research Center, The Hebrew University, Jerusalem 91904, IsraelRoie KnaanieInstitute of Chemistry and The Fritz Haber Research Center, The Hebrew University, Jerusalem 91904, IsraelBrian AlbeeDepartment of Chemistry, University of California, Irvine, California 92697, United StatesEric O. PotmaDepartment of Chemistry, University of California, Irvine, California 92697, United StatesR. Benny GerberDepartment of Chemistry, University of California, Irvine, California 92697, United States

2013en

ABI

Abstract

The vibrational spectroscopy of C-H stretches in organic molecules is of considerable importance for the characterization of these systems and for exploration of their properties. These stretches are strongly anharmonic, and thus methods including anharmonicity have to be used. The vibrational self-consistent field (VSCF) is applied to the following organic compounds: acetone, dimethylacetylene, neopentane, toluene, ethylene, and cyclopropane. The computed spectra are compared to new experimental data, including Raman measurements of all molecules except cyclopropane and IR of acetone, neopentane, and ethylene. A high level of agreement is found for all of the molecules. The characteristic features of CH3 and CH2 groups are studied and analyzed in detail. A reliable, unambiguous assignment of vibrational modes to spectral peaks is provided. Several characteristic features of CH3 and CH2 vibrations in polyatomic molecules are clarified, providing easier assignments for different types of organic molecules.

Identifiers

DOI: 10.1021/jp4014674

Citations and references

Cited by 20 references

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