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¹H NMR of Labile Protons: Temporal Resolution01:10

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Protons bonded to heteroatoms such as nitrogen and oxygen exhibit a range of chemical shift values. This is due to the varying degree of hydrogen bonding between the proton and the heteroatom in other molecules. The extent of hydrogen bonding affects the electron density around the proton, thereby giving different chemical shift values for the protons in the proton NMR spectrum.
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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.
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Two-Dimensional (2D) NMR: Overview01:12

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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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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...
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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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Visualizing transient dark states by NMR spectroscopy.

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Area of Science:

  • Structural biology
  • Biophysics
  • Biochemistry

Background:

  • Many crucial biological processes involve 'dark' states invisible to traditional structural methods.
  • These states are often transient, low in population, large, or heterogeneous, hindering analysis.
  • Dark states are vital as protein encounter complexes and in folding/aggregation pathways.

Purpose of the Study:

  • To review advanced nuclear magnetic resonance (NMR) spectroscopy techniques for characterizing 'dark' biological states.
  • To introduce methods enabling high-resolution analysis of otherwise invisible molecular states.
  • To detail specific techniques like paramagnetic relaxation enhancement and dark state exchange saturation transfer.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy adapted for 'dark' states.
  • Techniques include paramagnetic NMR, relaxation dispersion, saturation transfer, lifetime line broadening, and hydrogen exchange.
  • Focus on methods exploiting dynamic equilibrium between visible and invisible states.

Main Results:

  • These NMR methods enable high-resolution characterization of transient and heterogeneous biological states.
  • Paramagnetic relaxation enhancement and dark state exchange saturation transfer are highlighted for their utility.
  • The techniques allow exploration of dark states over various timescales.

Conclusions:

  • Advanced NMR methods provide unprecedented access to 'dark' biological states.
  • Understanding these states is critical for elucidating fundamental biological processes.
  • These techniques open new avenues for structural and dynamic biological research.