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Related Concept Videos

NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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π Electron Effects on Chemical Shift: Overview01:27

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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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Spin–Spin Coupling Constant: Overview01:08

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
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IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

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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.
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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...
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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Vibronic Correlations in Molecular Strong-Field Dynamics.

Marie Labeye1, Camille Lévêque2, François Risoud2

  • 1PASTEUR, Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France.

The Journal of Physical Chemistry. A
|April 8, 2024
PubMed
Summary
This summary is machine-generated.

We explored ultrafast molecular vibrations using intense infrared light. Our simulations reveal electron-nuclear interactions influencing molecular motion, dependent on laser pulse phase, offering new experimental insights.

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Area of Science:

  • Physical Chemistry
  • Molecular Dynamics
  • Quantum Control

Background:

  • Ultrafast molecular dynamics studies probe electron and nuclear motion on femtosecond timescales.
  • Intense laser fields can induce novel chemical pathways and molecular transformations.
  • Understanding vibronic coupling is crucial for controlling molecular behavior.

Purpose of the Study:

  • To investigate ultrafast vibronic dynamics in small molecules triggered by intense femtosecond infrared pulses.
  • To provide a new interpretation of nuclear wave packet dynamics, focusing on bond oscillation phases.
  • To reveal and explain intricate features in field-induced nuclear motion beyond existing models.

Main Methods:

  • Numerical simulations using 2D model molecules.
  • Analysis within the framework of the Lochfrass and bond-softening models.
  • Focus on the phase of bond oscillations and carrier envelope phase dependence.

Main Results:

  • A novel interpretation of nuclear wave packet dynamics, emphasizing oscillation phases.
  • Identification of intricate features in field-induced nuclear motion not explained by current models.
  • Attribution of these features to strong electron-nuclear dynamical correlations.

Conclusions:

  • Electron-nuclear correlations significantly influence molecular motion under intense laser fields.
  • These correlations are sensitive to the carrier envelope phase of the laser pulse, even for longer pulses.
  • The predicted effects should be experimentally observable, offering new avenues for molecular control.