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Related Concept Videos

2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

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

Two-Dimensional (2D) NMR: Overview

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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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
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Published on: December 16, 2013

Double orthogonal sample design scheme and corresponding basic patterns in two-dimensional correlation spectra for

Chengfeng Zhang1, Kun Huang, Huizhen Li

  • 1Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China.

The Journal of Physical Chemistry. A
|October 13, 2009
PubMed
Summary

A new double orthogonal sample design scheme (DOSD) enhances two-dimensional (2D) spectroscopy for studying molecular interactions. This method removes spectral interference, revealing subtle changes crucial for understanding intermolecular forces.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Physical Chemistry

Background:

  • Intermolecular interactions are fundamental to chemical processes but often obscured by spectral overlap in conventional methods.
  • Two-dimensional (2D) correlated spectroscopy offers enhanced resolution but can still suffer from interference.
  • Understanding molecular interactions requires detailed analysis of spectral variations.

Purpose of the Study:

  • To introduce a novel Double Orthogonal Sample Design Scheme (DOSD) for probing intermolecular interactions.
  • To improve the analysis of 2D correlated spectra by removing interfering components.
  • To provide a method for detailed molecular structural insights into intermolecular interactions.

Main Methods:

  • Development of the Double Orthogonal Sample Design Scheme (DOSD) based on mathematical analysis of orthogonal vectors.
  • Application of DOSD to generate 2D correlated spectra (synchronous and asynchronous) using specifically designed concentration series.
  • Utilizing a model system of two solutes and a real chemical system (iodine-benzene in CCl4) for validation.

Main Results:

  • The DOSD approach effectively removes interfering portions from synchronous and asynchronous 2D spectra.
  • Simulation and experimental results demonstrate DOSD's ability to detect subtle spectral variations (bandwidth, peak position, absorptivity) caused by intermolecular interactions.
  • Complementary information on intermolecular interactions is obtained, overcoming limitations of 1D spectra.

Conclusions:

  • The DOSD approach significantly enhances the capability of 2D correlated spectroscopy for studying intermolecular interactions.
  • DOSD provides a powerful tool for detailed molecular structural analysis of interactions, even with severe band overlap.
  • The method is validated for real chemical systems, offering new opportunities in chemical analysis and molecular understanding.