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Related Concept Videos

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

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

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...
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...
Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
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...
2D NMR: Homonuclear Correlation Spectroscopy (COSY)01:06

2D NMR: Homonuclear Correlation Spectroscopy (COSY)

Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...
2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other axis.

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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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High-resolution intermolecular zero-quantum coherence spectroscopy under inhomogeneous fields with effective solvent

Xi Chen1, Meijin Lin, Zhong Chen

  • 1Department of Physics, State Key Laboratory of Physical Chemistry of Solid Surface, Xiamen University, Xiamen, 361005, PR China.

Physical Chemistry Chemical Physics : PCCP
|November 30, 2007
PubMed
Summary

This study introduces a new NMR method, iDQF-HOMOGENIZED, to improve spectral resolution by suppressing unwanted signals. This technique enhances clarity in complex samples, paving the way for better in vivo spectroscopy.

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Published on: March 22, 2019

Area of Science:

  • Magnetic Resonance Spectroscopy
  • Biophysical Chemistry

Background:

  • Intermolecular zero-quantum coherences (iZQCs) offer high-resolution NMR in inhomogeneous fields.
  • Previous iZQC methods suffer from residual single-quantum coherences (SQCs) and t(1) noise, mainly from solvent signals.

Purpose of the Study:

  • To develop a novel pulse sequence for suppressing residual SQC and solvent iZQC signals.
  • To enhance spectral resolution and solvent suppression in NMR spectroscopy.

Main Methods:

  • A modified HOMOGENIZED pulse sequence incorporating an intermolecular double-quantum filter (iDQF) was developed, termed iDQF-HOMOGENIZED.
  • The solvent-suppression efficiency was analyzed, and the new sequence was compared to existing methods.

Main Results:

  • The iDQF-HOMOGENIZED sequence effectively suppressed residual conventional SQC signals and solvent iZQC signals.
  • Dramatic resolution enhancement and significant solvent suppression were observed in grape sarcocarp measurements.

Conclusions:

  • The iDQF-HOMOGENIZED method significantly improves spectral quality by reducing noise and enhancing resolution.
  • The technique shows promise for advanced in vivo spectroscopy applications, particularly in complex biological samples.