MAGNETIC-FIELD EFFECTS IN A POLYMER-CHAIN-LINKED DONOR-ACCEPTOR SYSTEM

The magnetic field effect on the intramolecular exciplex luminescence of a polymer-chain-linked pyrene-dimethylaniline system has been studied using both steady-state and time-resolved techniques. The dependence of the exciplex luminescence (phi) and the relative change in the luminescence in the presence of a magnetic field (DELTA-phi/phi) on the wavelength lambda and dielectric constant (epsilon) of the medium has been investigated. Although the rise and decay times of this system are quite long compared to the unlinked pyrene-dimethylaniline system, the epsilon(max) value, at which DELTA-phi/phi reaches its maximum, and the B1/2 value are nearly the same as those obtained in the unlinked system. The decay curves of the linked system in the absence and in the presence of a field have been rationalized.