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Related Concept Videos

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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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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Electrons are negatively charged subatomic particles that are attracted to an orbit around the positively-charged nucleus of an atom. They reside in locations that are associated with energy levels called shells and are further organized into sub-shells and orbitals within each shell.
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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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Conformational dynamics modulating electron transfer.

Dmitry V Matyushov1

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Summary
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Donor-acceptor distance dynamics introduce a new timescale for electron tunneling, influencing electron transfer reactions. Flexible complexes favor dynamics-controlled transfer, guiding energy chain design.

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Area of Science:

  • Chemical Kinetics
  • Physical Chemistry
  • Biophysics

Background:

  • Electron transfer reactions are fundamental in chemistry and biology.
  • The kinetics of electron transfer are often influenced by molecular dynamics and solvent polarization.
  • Understanding the interplay between distance dynamics and medium polarization is crucial for controlling electron transfer rates.

Purpose of the Study:

  • To investigate the role of diffusional dynamics of donor-acceptor distance in electron tunneling.
  • To elucidate the competition between distance dynamics and medium polarization in electron transfer kinetics.
  • To identify optimal design principles for energy chains based on electron transport.

Main Methods:

  • Analysis of electron transfer rate constants and their dependence on donor-acceptor distance.
  • Characterization of the crossover distance where electron transfer kinetics transition between regimes.
  • Modeling the influence of donor-acceptor displacement variance on relaxation time.

Main Results:

  • A new timescale of diffusion emerges for electron tunneling over specific distances.
  • The pre-exponential factor of the electron transfer rate constant exhibits a switch at a crossover distance.
  • Flexible donor-acceptor complexes demonstrate a higher propensity for dynamics-controlled electron transfer.

Conclusions:

  • Diffusional dynamics of donor-acceptor distance significantly impact electron transfer kinetics.
  • Energy chains can be optimized by positioning redox cofactors near the identified crossover distance.
  • The findings provide insights into controlling electron transfer processes for energy applications.