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NMR Multidimensional Spectroscopy Method for Measuring Hydrogen-Hydrogen Coupling Constants of Multiple Coupling Networks

A technology of nuclear magnetic resonance and coupling network, which is applied in the direction of analysis, measurement of magnetic variables, and measuring devices using nuclear magnetic resonance

Inactive Publication Date: 2018-01-02
XIAMEN UNIV
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Problems solved by technology

However, this method can only measure the coupling constants in the coupled network of one selected core at a time

Method used

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  • NMR Multidimensional Spectroscopy Method for Measuring Hydrogen-Hydrogen Coupling Constants of Multiple Coupling Networks
  • NMR Multidimensional Spectroscopy Method for Measuring Hydrogen-Hydrogen Coupling Constants of Multiple Coupling Networks
  • NMR Multidimensional Spectroscopy Method for Measuring Hydrogen-Hydrogen Coupling Constants of Multiple Coupling Networks

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Embodiment Construction

[0029] Below in conjunction with accompanying drawing and embodiment, the present invention will be further described:

[0030] A nuclear magnetic resonance multidimensional spectroscopy method for simultaneously measuring hydrogen-hydrogen coupling constants of multiple coupling networks, the main steps of which are:

[0031] 1) collecting the NMR one-dimensional spectrum of the sample;

[0032] 2) Measure the pulse width of the 90-degree hard pulse of the sample;

[0033] 3) Determine the scope of the hydrogen spectrum that needs to be analyzed;

[0034] 4) take the central frequency of the range of the hydrogen spectrum to be analyzed as the excitation center of the soft pulse, determine the soft pulse width according to the peak interval of the hydrogen spectrum to be analyzed, and measure the power of the 180-degree soft pulse of the sample;

[0035] 5) Determine the spatial encoding gradient G 1 , to satisfy γ*G 1 *L>SW1D, where γ is the gyromagnetic ratio of the hyd...

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Abstract

The invention provides a nuclear magnetic resonance multidimensional spectrum method for simultaneously measuring the hydrogen-hydrogen coupling constants of multiple coupling networks. Firstly, a 90-degree hard pulse is applied to rotate the magnetization vector from the Z direction to the XY plane. After t1 / 2 time, a selective 180-degree soft pulse is applied, and a magnetic field gradient in the Z direction is applied at the same time, so that the selective 180-degree soft pulse excites different nuclei at different spatial positions. Then apply the PSYCHE module. Gradients of equal strength and direction are applied on both sides of the PSYCHE module to dephase unwanted signals. Then, after t1 / 2 time, the EPSI sampling module is used to obtain chemical shift information and spatial position information at the same time. In this way, the coupling between other nuclei and the nuclei excited by the 180-degree soft pulse in the same layer can be obtained in different layers, and these couplings will show split peaks in the indirect dimension. The corresponding J-coupling constants can then be measured from these split peaks.

Description

technical field [0001] The invention relates to a nuclear magnetic resonance multidimensional spectrum method, in particular to a nuclear magnetic resonance multidimensional spectrum method capable of accurately measuring hydrogen-hydrogen J coupling constants of multiple coupling networks in molecules. Background technique [0002] The interaction between spin nuclei and spin nuclei is a main information in NMR spectra, which plays an important role in molecular structure analysis. Among them, the triple bond J coupling between hydrogen and hydrogen is widely used in the study of molecular conformation because its coupling constant is related to the dihedral angle formed by the triple bond. However, the coupling constants between hydrogen and hydrogen are often submerged in one-dimensional NMR spectra due to narrow chemical shift distributions, complex split peak modes, and large spectral peak linewidths. Davy Sinnaeve from the UK proposed a PSYCHEDELIC method (Sinnaeve D,...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N24/08
CPCG01N24/08G01R33/4633G01R33/4608G01R33/4616G01R33/4625
Inventor 林雁勤曾庆陈金永陈忠
Owner XIAMEN UNIV
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