Magnetic field and polarized light dependence of chemically induced dynamic nuclear polarization (CIDNP) of acridines and quinoxalines in various solvents

Abstract

Acridine and quinoxalines exhibits nuclear polarizations during irradiation in various solvents. In order to elucidate the origin of these polarizations, we have studied the magnetic field and polarized light dependence of the nuclear polarizations in different solvents. The results are interpreted in terms of two different mechanisms. The effects observed in proton-donor solvents are ascribed to a redical-pair mechanism with contribution from what could be a triplet Overhauser mechanism. This last mechanism explains the polarizations observed in benzene solution.