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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
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Mass Spectrometry: Cycloalkane Fragmentation01:05

Mass Spectrometry: Cycloalkane Fragmentation

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In mass spectrometry, cycloalkanes exhibit distinct fragmentation patterns due to the inherent stability of their molecular ions compared to linear or branched alkanes. The ring structure of cycloalkanes provides additional stability to the molecular ions, often resulting in prominent ion peaks in the mass spectrum.
For example, cyclohexane molecular ions have a mass-to-charge ratio (m/z) of 84, which tends to produce a stronger signal than linear alkanes like hexane. This stability comes from...
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¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

789
At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
1.0K
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

256
A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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Conformations of Cyclohexane02:11

Conformations of Cyclohexane

12.0K
Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
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Vibrational Analysis Based on Cavity-Enhanced Raman Spectroscopy: Cyclohexane.

Qing-Ying Yang1, Qin Yang2, Yi-Fan Song3

  • 1Hefei National Research Center of Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China.

The Journal of Physical Chemistry. A
|March 31, 2025
PubMed
Summary
This summary is machine-generated.

Cavity-enhanced Raman spectroscopy (CERS) analyzed gaseous cyclohexane, a petroleum-derived solvent. This technique successfully assigned numerous Raman-active bands, showcasing its utility for gas-phase molecular vibrational analysis.

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Area of Science:

  • Molecular Spectroscopy
  • Physical Chemistry
  • Chemical Physics

Background:

  • Cyclohexane (CAS: 110-82-7) is a vital organic solvent and a model for six-membered rings.
  • Accurate vibrational data is crucial for understanding molecular structure and dynamics.
  • Gas-phase analysis presents unique challenges for spectroscopic techniques.

Purpose of the Study:

  • To measure and assign polarized Raman spectra of gaseous cyclohexane.
  • To evaluate the capability of cavity-enhanced Raman spectroscopy (CERS) for gas-phase vibrational analysis.
  • To compare experimental spectral data with theoretical calculations.

Main Methods:

  • Utilized cavity-enhanced Raman spectroscopy (CERS) to obtain high-sensitivity spectra.
  • Measured polarized Raman spectra of gaseous cyclohexane at room temperature.
  • Analyzed spectral data in the range of 200-3200 cm-1, including intensities and depolarization ratios.

Main Results:

  • Successfully recorded and assigned several dozen Raman-active bands of gaseous cyclohexane.
  • Identified numerous overtone and combination bands, providing detailed vibrational information.
  • Demonstrated excellent agreement between experimental and calculated vibrational wavenumbers and depolarization ratios.

Conclusions:

  • Cavity-enhanced Raman spectroscopy (CERS) is highly effective for detailed vibrational analysis of gas-phase polyatomic molecules.
  • The study provides a comprehensive set of spectral data for gaseous cyclohexane.
  • This work validates CERS as a powerful tool for molecular spectroscopy.