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Continuous-Wave (CW) Photo-CIDNP NMR Spectroscopy: A Tutorial.

Lars T Kuhn1, Míriam Pérez-Trujillo2

  • 1Institut für Physikalische Chemie, Albert-Ludwigs-Universität Freiburg, Freiburg i. Br., Germany.

Magnetic Resonance in Chemistry : MRC
|September 5, 2025
PubMed
Summary
This summary is machine-generated.

Photo-chemically induced dynamic nuclear polarisation (photo-CIDNP) enhances NMR sensitivity for studying radical reactions and biomolecules. This tutorial guides users on performing 1D photo-CIDNP NMR experiments with practical setup and analysis advice.

Keywords:
NMRhyperpolarisationin situ spectroscopyphotochemistryphoto‐CIDNP

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Area of Science:

  • Magnetic Resonance Spectroscopy
  • Physical Chemistry
  • Biophysical Chemistry

Background:

  • Photo-chemically induced dynamic nuclear polarisation (photo-CIDNP) is a nuclear spin-selective phenomenon.
  • Traditionally used for mechanistic studies of radical reactions and probing biomolecular interactions.
  • Recent advances and benchtop NMR have renewed interest in photo-CIDNP as a sensitive hyperpolarisation method.

Purpose of the Study:

  • To provide practical guidance for nonexpert users on performing 1D proton (¹H) and heteronuclear photo-CIDNP NMR experiments.
  • To detail experimental setup, including light sources, coupling, and photosensitiser selection.
  • To explain data acquisition, analysis, and sample preparation for photo-CIDNP.

Main Methods:

  • Utilisation of high-field NMR spectrometers and continuous-wave (CW) illumination.
  • Description of suitable 1D ¹H and heteronuclear photo-CIDNP pulse schemes.
  • Explanation of photo-CIDNP-specific acquisition parameters and light source triggering.

Main Results:

  • Strategies for selecting appropriate experimental setups are presented.
  • Practical advice on sample preparation for photo-CIDNP is provided.
  • Guidance on meaningful acquisition and analysis of 1D photo-CIDNP data is given.

Conclusions:

  • Photo-CIDNP has matured into a versatile and highly sensitive NMR hyperpolarisation technique.
  • This tutorial equips users with the knowledge to implement 1D photo-CIDNP NMR.
  • The method offers enhanced sensitivity for diverse applications in chemistry and biology.