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2D NMR: Overview of Homonuclear Correlation Techniques

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...

Nuclear Overhauser Enhancement (NOE)

Nuclear Overhauser Enhancement (NOE)

Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling. This phenomenon, called the nuclear Overhauser enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring spin-active...

2D NMR: Overview of Heteronuclear Correlation Techniques

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.

Applications Of NMR In Biology

Applications Of NMR In Biology

Nuclear magnetic resonance (NMR) spectroscopy is a very valuable analytical technique for researchers. It has been used for more than 50 years as an analytical tool. F. Bloch and E. Purcell formulated NMR in 1946 and won the 1952 Nobel Prize in Physics for their work. Biological macromolecules such as proteins, nucleic acids, lipids, and organic molecules including pharmaceutical compounds, can be studied using this versatile tool that exploits the magnetic properties of certain nuclei.
The...

Two-Dimensional (2D) NMR: Overview

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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.

2D NMR: Homonuclear Correlation Spectroscopy (COSY)

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...

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Related Experiment Video

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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

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Janocchio--a Java applet for viewing 3D structures and calculating NMR couplings and NOEs.

David A Evans¹, Michael J Bodkin, S Richard Baker

¹Eli Lilly and Company Ltd, Lilly Research Centre, Windlesham, Surrey, GU20 6PH, UK.

Magnetic Resonance in Chemistry : MRC

|May 31, 2007

Summary

This study introduces a Java applet for calculating coupling constants and Nuclear Overhauser Effects (NOEs) from 3D structures. It enhances the Jmol program with advanced computational features for molecular analysis.

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Area of Science:

Computational Chemistry
Structural Biology
Molecular Modeling

Background:

Accurate calculation of coupling constants and Nuclear Overhauser Effects (NOEs) is crucial for determining molecular structures.
Existing tools may lack integrated capabilities for both coupling constant and NOE calculations from 3D structures.

Purpose of the Study:

To develop a user-friendly Java applet for calculating H-H and H-C 3-bond coupling constants and NOEs.
To integrate these calculation capabilities into the Jmol open-source molecular viewer.
To provide tools for further conformational analysis.

Main Methods:

The applet is based on the Jmol open-source program.
H-H coupling constants are calculated using the Altona equation.
NOEs are computed utilizing the full relaxation matrix approach.
A point-and-click interface drives all calculations.

Main Results:

The Java applet successfully calculates H-H and H-C 3-bond coupling constants.
The applet accurately computes NOEs via the full relaxation matrix method.
The program supports calculations on multi-structure files.
Input files for the NAMFIS conformational fitting program can be generated.

Conclusions:

The developed Java applet provides an integrated and accessible tool for calculating key NMR parameters (coupling constants and NOEs) from 3D molecular structures.
This tool enhances the functionality of Jmol for structural elucidation and conformational analysis.
The applet facilitates further computational studies by generating compatible input files for other programs.