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

Two-Dimensional (2D) NMR: Overview

1.0K
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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2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

354
Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
354
2D NMR: Homonuclear Correlation Spectroscopy (COSY)01:06

2D NMR: Homonuclear Correlation Spectroscopy (COSY)

1.5K
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...
1.5K
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

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

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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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2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

394
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...
394
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

371
Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
371

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Related Experiment Video

Updated: Oct 29, 2025

Author Spotlight: Unveiling the Potential of VSFG Microscopy in Studying Mesoscopically Heterogeneous Self-Assembled Structures
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Author Spotlight: Unveiling the Potential of VSFG Microscopy in Studying Mesoscopically Heterogeneous Self-Assembled Structures

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Two-dimensional pattern recognition methods for rapidly recording and interpreting high resolution coherent

Thresa A Wells1, Muhire H Kwizera1, Sarah M Chen2

  • 1Department of Chemistry and Biochemistry, Spelman College, 350 Spelman Lane, Atlanta, Georgia 30314, USA.

The Journal of Chemical Physics
|July 9, 2021
PubMed
Summary

High-resolution coherent 3D spectroscopy simplifies complex molecular analysis. New methods use fewer 2D scans and pattern recognition for faster, more accurate spectral assignments, even in congested spectra.

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Area of Science:

  • Spectroscopy
  • Quantum Chemistry
  • Physical Chemistry

Background:

  • High-resolution coherent multidimensional spectroscopy offers advanced peak sorting by species and quantum numbers.
  • Two-dimensional (2D) spectroscopy is simpler but limited for highly congested spectra.
  • Three-dimensional (3D) spectroscopy provides higher resolution but is complex and time-consuming.

Purpose of the Study:

  • To develop a faster and simpler method for high-resolution coherent 3D spectroscopy.
  • To enable efficient spectral analysis of challenging molecular systems.

Main Methods:

  • Designing 3D spectroscopy experiments using a limited number of strategically placed 2D scans.
  • Employing novel pattern recognition methods for data interpretation.
  • Investigating optimal four-wave mixing (FWM) processes and scanning strategies.

Main Results:

  • A faster approach to 3D spectroscopy by reducing data acquisition requirements.
  • Identification of optimum FWM processes and scanning strategies for pattern recognition.
  • Development of methods to identify FWM processes from observed spectral patterns.
  • Demonstration of advantages of nonparametric FWM processes over parametric ones.

Conclusions:

  • The developed method significantly simplifies and accelerates high-resolution coherent 3D spectroscopy.
  • Strategic 2D scans combined with pattern recognition offer a powerful alternative to full 3D data acquisition.
  • Understanding FWM processes and scanning strategies is crucial for effective spectral analysis.