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High-resolution magnetic resonant method for measuring two-dimensional J decomposition spectrum of coupling constant

A technology of nuclear magnetic resonance and coupling constant, which can be used in the fields of analysis, measurement device, material analysis by resonance, etc., which can solve the problem of reducing spectral resolution and so on.

Inactive Publication Date: 2020-01-10
XIAMEN UNIV
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Problems solved by technology

However, the conventional J-decomposition spectrum is affected by phase entanglement and can only be displayed in absolute value mode, which reduces the resolution of the spectrum

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  • High-resolution magnetic resonant method for measuring two-dimensional J decomposition spectrum of coupling constant
  • High-resolution magnetic resonant method for measuring two-dimensional J decomposition spectrum of coupling constant
  • High-resolution magnetic resonant method for measuring two-dimensional J decomposition spectrum of coupling constant

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Embodiment Construction

[0021] Below in conjunction with accompanying drawing and embodiment, the present invention will be further described:

[0022] A high-resolution nuclear magnetic resonance method for measuring the two-dimensional J decomposition spectrum of the coupling constant, the main steps are:

[0023] 1) collecting the NMR one-dimensional spectrum of the sample;

[0024] 2) Measure the pulse width of the 90-degree hard pulse of the sample;

[0025] 3) Set coherent selection gradient G 1 , G 2 and G 3 the intensity and duration of

[0026] 4) Set the center position of the hydrogen nucleus to be studied as the center frequency of the selective 180-degree pulse, determine the pulse width of the selective 180-degree pulse according to the signal distribution, and measure the power of the selective pulse;

[0027] 5) Determine the flip angle β, duration and scanning frequency range of the chirp pulse, and calibrate the corresponding power;

[0028] 6) Set the intensity of the encodin...

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Abstract

The invention provides a high-resolution magnetic resonant method for measuring two-dimensional J decomposition spectrum of a coupling constant. The high-resolution magnetic resonant method comprisesthe steps of firstly, applying 90-degree hard pulse to allow a magnetic vector to rotate from a Z direction to an XY plane; secondly, applying an improved spin echo module. Such an effect is in a waythat core-correlated J coupling acting with selected 180-degree pulse is reunited with indirect dimension, so that other J couplings are maintained to be converted in the indirect dimension, and chemical displacement and all J couplings are converted at normal conversion time of direct dimension. By the method, two-dimensional J decomposition spectrum possessing a pure absorption line type can beobtained; after 45-degree rotation on the obtained two-dimensional spectrum, projection spectrum of direct dimension is in a way that pure chemical displacement spectrum of coupling division correlated to the selected core is only maintained, and thus, the J coupling constant can be conveniently measured; and division information of other couplings is maintained by projection of the indirect dimension, and multiplet-mode analysis is helped.

Description

technical field [0001] The invention relates to a nuclear magnetic resonance method, in particular to a high-resolution nuclear magnetic resonance method for measuring a two-dimensional J decomposition spectrum of a coupling constant. Background technique [0002] NMR spectroscopy is a powerful analytical tool with a wide range of applications. J-coupling is an important parameter in NMR spectroscopy, which can provide valuable information about molecular structure and conformation. In general, the J-coupling constant can be measured from the signal splitting of a 1D spectrum. But signal crowding and even overlapping are common in NMR spectra due to the limited chemical shift range and signal splitting caused by scalar coupling. Two-dimensional J-decomposition spectroscopy can separate chemical shift and J-coupling into two dimensions, which greatly reduces signal crowding and facilitates the measurement of J-coupling constants. However, the conventional J-decomposition s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N24/08
CPCG01N24/087
Inventor 林雁勤曾庆陈金永陈忠
Owner XIAMEN UNIV
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