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Related Concept Videos

IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

2.0K
When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
2.0K
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

1.2K
A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to...
1.2K
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

816
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...
816
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

1.4K
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
1.4K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.0K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.0K
¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

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

1.1K
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.
1.1K

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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
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Fast vibrational analysis of molecular systems.

Hugo Petitjean1, Aude Giard1, Jean-Pierre Flament2

  • 1ICGM, Université de Montpellier, CNRS, ENSCM, Montpellier, France.

Journal of Computational Chemistry
|September 2, 2024
PubMed
Summary

VIBMOL is a new tool that analyzes molecular vibrational modes from quantum chemistry calculations. It simplifies infrared spectral assignments for complex molecules, aiding experimentalists.

Keywords:
FTIRcomputational chemistrypotential energy distributionvibrations

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Area of Science:

  • Computational Chemistry
  • Spectroscopy
  • Molecular Modeling

Background:

  • Infrared difference spectroscopy offers insights into complex molecular structures, such as metalloproteins.
  • Analyzing vibrational spectra can be challenging due to the large number of bands.
  • Ab initio modeling aids frequency assignment but generates vast data difficult for experimentalists to process.

Purpose of the Study:

  • To develop a computational tool, VIBMOL, for analyzing molecular vibrational modes.
  • To facilitate the interpretation of vibrational spectra and simplify infrared (IR) spectral assignments.
  • To bridge the gap between computational data and experimental needs in molecular structure analysis.

Main Methods:

  • Development of the VIBMOL program for analyzing vibrational modes from Hessian matrices.
  • Utilizing common quantum chemistry codes for calculations.
  • Integration with an interface program (gosdmu) for data formatting from GAUSSIAN.
  • Implementation of a graphical interface for mode visualization and spectral simulation.

Main Results:

  • VIBMOL enables calculation and visualization of normal modes.
  • The tool can simulate infrared spectra and explore Potential Energy Distribution.
  • It processes large datasets into user-friendly descriptors for experimentalists.
  • VIBMOL simplifies the assignment of IR spectra, particularly for complex molecules.

Conclusions:

  • VIBMOL provides an effective solution for analyzing vibrational modes and assigning IR spectra.
  • The tool enhances collaboration between computational and experimental scientists.
  • It offers a valuable resource for researchers studying molecular structures through vibrational spectroscopy.