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Related Concept Videos

IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

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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...
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¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

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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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2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

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Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
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2D NMR: Overview of Homonuclear Correlation Techniques01:16

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Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
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¹H NMR: Complex Splitting01:13

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A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
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IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

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Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
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Orientational time correlation functions for vibrational sum-frequency generation. 2. Propionitrile.

Shule Liu1, John T Fourkas

  • 1Department of Chemistry & Biochemistry, University of Maryland , College Park, Maryland 20742, United States.

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Summary

Molecular dynamics simulations reveal how molecular reorientation affects vibrational spectroscopy at interfaces. Reorientation significantly impacts asymmetric stretches, while symmetric stretches are affected only under specific polarization conditions.

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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Spectroscopy

Background:

  • Vibrational sum-frequency-generation (VSFG) spectroscopy is a powerful technique for probing molecular structure and dynamics at interfaces.
  • Understanding molecular reorientation is crucial for accurately interpreting VSFG spectra, especially at liquid/vapor (LV) and liquid/silica (LS) interfaces.

Purpose of the Study:

  • To investigate the influence of molecular reorientation on VSFG spectra of propionitrile at the LV and LS interfaces.
  • To analyze the contributions of methyl, methylene, and cyanide groups to the VSFG spectra through orientational time-correlation functions (TCFs).

Main Methods:

  • Molecular dynamics (MD) simulations were employed to model propionitrile at the interfaces.
  • Orientational time-correlation functions (TCFs) were calculated from MD trajectories to quantify molecular reorientation.
  • VSFG spectra were computed using the derived TCFs for different functional groups and polarization conditions.

Main Results:

  • Propionitrile molecules exhibit relatively fast reorientation in the bulk liquid.
  • Molecular reorientation significantly influences VSFG spectra for asymmetric stretching modes under all polarization conditions.
  • For symmetric stretching modes, reorientation plays a significant role only under SPS polarization conditions.
  • Azimuthal dynamics were found to be the dominant factor in the orientational TCFs.

Conclusions:

  • The study highlights the critical role of molecular reorientation in shaping VSFG spectra at interfaces.
  • Distinguishing between symmetric and asymmetric stretching modes is essential for understanding reorientation effects in VSFG spectroscopy.
  • MD simulations provide valuable insights into interfacial molecular dynamics and their spectroscopic signatures.