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Related Concept Videos

Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

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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.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
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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.
The –OH proton in alcohols typically appears in the range of δ 2 to 5 ppm but can vary depending on the specific...
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NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

1.0K
When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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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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Flat belts are crucial in many industrial applications as they help transmit power from one pulley to another. The concept of forces and moments is used to determine the maximum moment on a pulley. For instance, consider a flat belt that wraps around two pulleys, A and B, with radii of 30 cm and 10 cm, respectively. The angle between the belt and the horizontal is 20 degrees at the pulleys. As pulley B rotates clockwise and drives pulley A, tension T2 is caused at one end of the belt, while...
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Frictional Forces on Flat Belts01:28

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Flat belts are commonly used in various industrial applications for transmitting power from one pulley to another. When a flat belt is wrapped around a set of pulleys, it experiences different tensions at the driving pulley ends due to the friction between the belt and pulley surface. When the pulley moves in a counterclockwise direction, the tension T2 on the opposite side of the pulley where the belt is moving away from is higher than the tension T1 on the side where the belt is moving...
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One- and Two-Dimensional High-Resolution NMR from Flat Surfaces.

Brennan J Walder1, Christian Berk2, Wei-Chih Liao2

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Researchers developed ultrahigh sensitivity nuclear magnetic resonance (NMR) to analyze molecules on 2D surfaces. This breakthrough enables detailed atomic-level characterization of small samples, advancing chemical analysis.

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Area of Science:

  • Chemistry
  • Materials Science
  • Biophysics

Background:

  • Determining atomic-level characteristics of molecules on 2D surfaces is a significant challenge.
  • High-resolution nuclear magnetic resonance (NMR) offers rich structural information but suffers from low sensitivity for 2D materials.

Purpose of the Study:

  • To overcome the sensitivity limitations of NMR for analyzing molecules on 2D surfaces.
  • To enable high-resolution NMR spectroscopy on picomole quantities of materials.

Main Methods:

  • Achieved >10^5 fold sensitivity improvement in NMR.
  • Combined dynamic nuclear polarization, multiple-echo acquisition, and optimized sample formulation.
  • Obtained high-resolution 1D and 2D 31P NMR spectra from 160 picomoles of oligonucleotide functionalities on glass and sapphire wafers.

Main Results:

  • Demonstrated ultrahigh NMR sensitivity for 2D surface analysis.
  • Successfully observed DNA bound to miRNA using 31P NMR.
  • Sensed conformational changes due to ion binding and followed photochemical degradation reactions.

Conclusions:

  • Ultrahigh sensitivity NMR is now applicable to 2D materials.
  • 31P NMR can provide detailed insights into molecular interactions and dynamics on surfaces.
  • This technique opens new avenues for studying complex chemical and biological systems.