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Title:Cyclohexane Vibrations: High Resolution Spectra And Anharmonic Local Mode Calculations
Author(s):Bernath, Peter F.
Contributor(s):Sibert, Edwin
Subject(s):Rotational structure/frequencies
Abstract:High resolution infrared absorption spectra of cyclohexane (C$_6$H$_{12}$) have been recorded from 1100 to 4000 cm$^{-1}$ at room temperature and 241 K. Cyclohexane is an oblate symmetric top with $D_{3d}$ symmetry. A rotational analysis was obtained for the $\nu_{27}$ (e$_{\rm{u}}$) and $\nu_{14}$ (a$_{\rm{2u}}$) CH$_2$ scissor modes at 1452.9 cm$^{-1}$ and 1456.4 cm$^{-1}$, respectively. Several combination modes were also assigned and rotationally analyzed. The C-H stretching modes are perturbed by overtone and combination modes of the CH$_2$ scissor vibrations, and an anharmonic local mode calculation was needed to interpret the spectra. The 4 main strong allowed C-H stretching modes appear as two e$_{\rm{u}}$ a$_{\rm{2u}}$ pairs near at 2862 cm$^{-1}$ and 2933 cm$^{-1}$. The Fermi-resonance local mode model coupling terms give physical insight into the effects that organize the cyclohexane vibrational energy levels. The unstrained cyclohexane molecule is a useful paradigm for six-membered rings in larger chemical and biological systems.
Issue Date:2021-06-24
Publisher:International Symposium on Molecular Spectroscopy
Genre:Conference Paper / Presentation
Date Available in IDEALS:2021-09-24

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