Term: Chemically Induced Dynamic Nuclear Polarization (CIDNP)
https://doi.org/10.1351/goldbook.C01079

Definition:
Non-Boltzmann nuclear spin state distribution produced in thermal or photochemical reactions, usually from colligation and diffusion, or disproportionation of radical pairs, and detected by NMR spectroscopy by enhanced absorption or emission signals.

Related Terms:
1) colligation (http://doi.org/10.1351/goldbook.C01153).
2) disproportionation (http://doi.org/10.1351/goldbook.D01799).
3) radical pairs (http://doi.org/10.1351/goldbook.R05074).
4) diffusion (http://doi.org/10.1351/goldbook.D01716).
5) spectroscopy (http://doi.org/10.1351/goldbook.S05848).

Source: PAC, 1994, 66, 1077. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)' on page 1097 (https://doi.org/10.1351/pac199466051077)

Citation: 'Chemically Induced Dynamic Nuclear Polarization (CIDNP)' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.C01079

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