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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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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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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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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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Optically Enhanced Solid-State 1H NMR Spectroscopy.

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Researchers achieved a 16-fold bulk signal enhancement in solid-state proton (¹H) NMR using optically enhanced photochemically induced dynamic nuclear polarization (photo-CIDNP). This breakthrough overcomes limitations of current hyperpolarization techniques for broader applications.

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Area of Science:

  • Magnetic Resonance Spectroscopy
  • Photochemistry
  • Solid-State NMR

Background:

  • Low sensitivity limits Nuclear Magnetic Resonance (NMR) applications.
  • Photochemically induced dynamic nuclear polarization (photo-CIDNP) enhances NMR signals but is rare in solids.
  • Previous solid-state photo-CIDNP was limited to low-sensitivity nuclei (¹³C, ¹⁵N).

Purpose of the Study:

  • To demonstrate optically enhanced solid-state ¹H NMR spectroscopy.
  • To achieve bulk hyperpolarization in solid-state NMR using photo-CIDNP.
  • To overcome limitations of low-sensitivity nuclei in photo-CIDNP.

Main Methods:

  • Utilized photo-CIDNP in a donor-chromophore-acceptor system in frozen solution.
  • Employed continuous laser irradiation at 450 nm.
  • Operated at high magnetic field (0.3 T) and low temperature (85 K).

Main Results:

  • Achieved the first optically enhanced solid-state ¹H NMR spectroscopy.
  • Observed a 16-fold bulk ¹H signal enhancement.
  • Demonstrated spin diffusion relaying polarization through the sample.

Conclusions:

  • Photo-CIDNP can be effectively used for bulk hyperpolarization of abundant ¹H nuclei in solids.
  • This method offers a new strategy for hyperpolarized NMR beyond conventional techniques.
  • Enables advanced chemical and structural studies previously limited by NMR sensitivity.