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Related Concept Videos

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

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.
According to Hooke's law, the vibrational frequency is directly proportional to the...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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.
Spin decoupling is usually achieved by...
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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 slanted or...
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.

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Ensemble Force Spectroscopy by Shear Forces
07:30

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Published on: July 26, 2022

Hidden multiple bond effects in dynamic force spectroscopy.

Sebastian Getfert1, Peter Reimann

  • 1Universität Bielefeld, Fakultät für Physik, Bielefeld, Germany. getfert@physik.uni-bielefeld.de

Biophysical Journal
|March 13, 2012
PubMed
Summary
This summary is machine-generated.

Analyzing multiple molecular bonds in dynamic force spectroscopy is challenging. Hidden multiple bonds, indistinguishable from single bonds, significantly affect rupture force data and interpretation.

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Area of Science:

  • Biophysics
  • Chemical Physics
  • Materials Science

Background:

  • Dynamic force spectroscopy (DFS) measures bond rupture forces under increasing load.
  • Interpreting DFS data is complex, especially with multiple bonds involved.
  • Multiple rupture events are often excluded from analysis, potentially biasing results.

Purpose of the Study:

  • To develop and analyze a model for DFS experiments with multiple molecular bonds.
  • To investigate the impact of hidden multiple bonds on rupture force statistics.
  • To improve the theoretical interpretation of DFS data.

Main Methods:

  • Developed a detailed numerical model of the complete DFS experiment.
  • Included molecular clustering, bond formation, dissociation under load, and data postprocessing.
  • Simulated experiments to analyze rupture force distributions.

Main Results:

  • Identified that even after removing obvious multiple rupture events, hidden multiple bonds persist.
  • Demonstrated that these hidden multiple bonds are experimentally indistinguishable from single bonds.
  • Showed significant effects of hidden multiple bonds on rupture force statistics.

Conclusions:

  • Standard DFS data analysis may overlook crucial information from hidden multiple bonds.
  • A more comprehensive theoretical framework is needed to accurately interpret DFS data.
  • Considering multiple bond effects is essential for precise understanding of molecular interactions.