Q. Meng et al., STUDIES OF PHOTOCHEMICAL-REACTION BY CIDNP-DETECTED ESR-SPECTRUM, Proceedings of the Indian Academy of Sciences. Chemical sciences, 105(6), 1993, pp. 619-628
CIDNP-detected ESR spectroscopy was applied to the study of photochemi
cal reaction. In the CIDNP-detected ESR spectroscopy, the spectrum due
to intermediate radical pairs and the spectrum due to free (escaped)
radicals can be separately observed. The spectrum due to radical pairs
is called stimulated nuclear polarization (SNP), and the spectrum due
to free radicals is called dynamic nuclear polarization (DNP). The me
thod was applied to the study of photochemical reaction of 2,6-dichlor
obenzoquinone and the isomerization of quadricyclane assisted by photo
induced electron transfer, and the chemical species of the intermediat
e radical pair and of the radical were clarified.