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2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

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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...
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2D NMR: Overview of Homonuclear Correlation Techniques01:16

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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.
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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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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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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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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.
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Multiphysics NMR correlation spectroscopy.

Yi-Qiao Song1, Andre Souza2, Muthusamy Vembusubramanian3

  • 1Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Charlestown, MA, USA; John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA; Schlumberger-Doll Research, 1 Hampshire street, Cambridge, MA 02139, USA.

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Summary
This summary is machine-generated.

This study introduces a novel correlation spectroscopy technique combining nuclear magnetic resonance (NMR) spin dynamics and capillary drainage. This method reveals pore connectivity in porous materials by generating a joint capillary pressure (Pc) and NMR relaxation (T2) map.

Keywords:
Capillary drainageMulti-dimensional experimentsPore structureRelaxation

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Area of Science:

  • Nuclear Magnetic Resonance Spectroscopy
  • Materials Science
  • Physical Chemistry

Background:

  • Modern nuclear magnetic resonance (NMR) spectroscopy relies on multi-dimensional correlation experiments, typically focusing solely on spin Hamiltonians.
  • Spin systems can be influenced by external interactions and processes beyond the spin degree of freedom, limiting conventional NMR analysis.
  • Understanding porous materials requires methods that probe pore connectivity and fluid dynamics simultaneously.

Purpose of the Study:

  • To demonstrate a novel correlation spectroscopy technique linking NMR spin dynamics with capillary drainage.
  • To investigate the interconnectedness of pores within porous materials.
  • To develop a new analytical approach for characterizing porous media beyond conventional NMR or capillary pressure measurements.

Main Methods:

  • Development of a dual-process correlation spectroscopy combining NMR spin dynamics and capillary drainage.
  • Acquisition of a joint capillary pressure (Pc) and NMR relaxation (T2) correlation function.
  • Generation of a Pc-T2 map to visualize pore connectivity.

Main Results:

  • Successful demonstration of correlation spectroscopy between NMR spin dynamics and capillary drainage.
  • Generation of a unique Pc-T2 map providing insights into pore network structure.
  • Identification of pore connectivity information unattainable through conventional NMR or capillary drainage experiments alone.

Conclusions:

  • The developed correlation spectroscopy offers a powerful new tool for studying porous materials.
  • The Pc-T2 map provides unprecedented insights into pore connectivity and fluid transport mechanisms.
  • This technique advances the characterization of porous media by integrating spin dynamics and fluid flow phenomena.