Polarization transfer in CIDNP experiments via scalar paramagnetic exchange mechanisms

A theory is outlined explaining how chemically induced nuclear polarization can be transfered by a diamagnetic-paramagnetic exchange reaction from a group of nuclei to another group not originally polarized. The mechanism depends critically on the scalar nuclear spin-spin coupling in the diamagnetic state. Experiments on the photochemical charge transfer between N,N-diethylaniline and pyrene are given as an example of this polarization transfer.