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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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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.
Spin decoupling is usually achieved by...
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¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

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

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

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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...
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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

1.4K
Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
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IR Spectrum Peak Broadening: Hydrogen Bonding01:23

IR Spectrum Peak Broadening: Hydrogen Bonding

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The vibrational frequency of a bond is directly proportional to its bond strength. As a result, stronger bonds vibrate at higher frequencies, while weaker bonds vibrate at lower frequencies. The stretching vibration of the strong O–H bond in alcohols and phenols (very dilute solution or gas phase) appears as a sharp peak at 3600–3650 cm−1.
However, the extent of hydrogen bonding influences the observed stretching frequency and band broadening. Intermolecular or intramolecular...
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Probing Residual Water in G-Quadruplex Structures through Molecular Vibrations.

Valeria Libera1, Sara Catalini2,3, Francesca Ripanti4

  • 1Dipartimento di Fisica e Geologia, Università di Perugia, Via Pascoli, 06123 Perugia, Italy.

The Journal of Physical Chemistry. B
|September 19, 2025
PubMed
Summary
This summary is machine-generated.

This study reveals how water interacts differently with hybrid and parallel G-quadruplexes (GQs) using dual spectroscopy. This finding deepens our understanding of G-quadruplex stability and function in biological systems.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Spectroscopy

Background:

  • G-quadruplexes (GQs) are noncanonical DNA structures crucial for gene regulation and genome stability.
  • GQ structural polymorphism is significantly influenced by their surrounding solvation environment.
  • Understanding solute-solvent interactions is key to elucidating GQ stability and function.

Purpose of the Study:

  • To investigate the role of solvation environment on G-quadruplex (GQ) structural polymorphism.
  • To probe solute-solvent interactions in GQ dilute solutions during thermal unfolding.
  • To correlate vibrational properties with secondary structural features of GQs.

Main Methods:

  • Employed a dual-spectroscopy approach combining ultraviolet resonance Raman (UVRR) scattering and circular dichroism (CD).
  • Utilized UVRR scattering to enhance vibrational features of GQs and probe solute-solvent interactions.
  • Analyzed the O-H stretching vibrational band to study the hydrogen-bonded water network.

Main Results:

  • Demonstrated differential water molecule interactions with hybrid and parallel GQ conformers.
  • Showcased the ability of coupled UVRR and CD spectroscopy to link vibrational properties with secondary structures.
  • Confirmed the utility of UVRR scattering for studying GQs, a novel application for this biosystem.

Conclusions:

  • The combined UVRR and CD spectroscopy approach effectively correlates vibrational data with GQ secondary structures, even with significant solvent contributions.
  • Water molecules interact distinctively with different GQ conformers, highlighting the importance of solvation.
  • This methodology offers a promising avenue for deeper insights into GQ stability and function across various GQ structures.