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

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

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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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Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
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¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

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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.
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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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Double Resonance Techniques: Overview01:12

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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2D NMR: Overview of Heteronuclear Correlation Techniques01:18

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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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Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package
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Nonadiabatic Excited-State Molecular Dynamics Methodologies: Comparison and Convergence.

Victor M Freixas1, Alexander J White2, Tammie Nelson2

  • 1Universidad Nacional de Quilmes, Roque Saénz Peña 352, B1876BXD Bernal, Argentina.

The Journal of Physical Chemistry Letters
|March 17, 2021
PubMed
Summary

Simulating nonadiabatic molecular dynamics is complex. This study compares Ehrenfest, surface hopping, and multiconfigurational Ehrenfest with ab initio multiple cloning (MCE-AIMC) methods for large chromophores, offering guidance for excited-state dynamics simulations.

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Area of Science:

  • Computational chemistry
  • Theoretical physics
  • Quantum mechanics

Background:

  • Direct atomistic simulation of nonadiabatic molecular dynamics offers fundamental physical insights but faces challenges.
  • Diverse computational frameworks exist, lacking standardized implementations for performance comparison.
  • Accurate simulation of excited-state molecular dynamics is crucial for understanding photochemical and photophysical processes.

Purpose of the Study:

  • To compare the performance of three popular nonadiabatic molecular dynamics methods: Ehrenfest, surface hopping, and multiconfigurational Ehrenfest with ab initio multiple cloning (MCE-AIMC).
  • To evaluate these methods for simulating population relaxation and coherent vibronic dynamics in large chromophores.
  • To investigate the numerical convergence of MCE-AIMC algorithms.

Main Methods:

  • Implementation of Ehrenfest, surface hopping, and MCE-AIMC methods within the NEXMD software.
  • Utilizing a common computational chemistry model for consistent comparisons.
  • Analysis of population relaxation and coherent vibronic dynamics.
  • Numerical convergence studies for MCE-AIMC, varying trajectory number, cloning thresholds, and wavepacket width.

Main Results:

  • Comparative performance analysis of Ehrenfest, surface hopping, and MCE-AIMC methods for large chromophores.
  • Identification of method-specific behaviors in population relaxation and vibronic dynamics.
  • Demonstration of numerical convergence properties for MCE-AIMC algorithms.
  • Provision of reference data for selecting appropriate simulation methodologies.

Conclusions:

  • The study provides crucial comparative data for selecting optimal methods in excited-state molecular dynamics simulations.
  • Understanding the performance nuances of different algorithms is essential for accurate theoretical predictions.
  • The findings aid researchers in choosing the most suitable approach for their specific computational chemistry problems.