CIDNP
Sign in to saveAlso known as chemically induced dynamic nuclear polarization
CIDNP (chemically induced dynamic nuclear polarization), often pronounced like "kidnip", is a nuclear magnetic resonance (NMR) technique that is used to study chemical reactions that involve radicals. It detects the non-Boltzmann (non-thermal) nuclear spin state distribution produced in these reactions as enhanced absorption or emission signals.
~6 min read
Encyclopedic overview
7 sectionsContents
- Concept and experimental set-up
- Radical pair mechanism
- Typical photochemical reaction
- Applications
- See also
- References
- Further reading
CIDNP (chemically induced dynamic nuclear polarization), often pronounced like "kidnip", is a nuclear magnetic resonance (NMR) technique that is used to study chemical reactions that involve radicals. It detects the non-Boltzmann (non-thermal) nuclear spin state distribution produced in these reactions as enhanced absorption or emission signals.
CIDNP was discovered in 1967 by Bargon and Fischer, and, independently, by Ward and Lawler. Early theories were based on dynamic nuclear polarisation (hence the name) using the Overhauser effect. The subsequent experiments, however, have found that in many cases DNP fails to explain CIDNP polarization phase. In 1969 an alternative explanation arose which relies on the nuclear spins affecting the probability of a radical pair recombining or separating.
Excerpted from Wikipedia’s “CIDNP” article, available under the CC BY-SA 4.0 licence.